Why Venus Became an Essonne UFO

Introduction

In Essonne, some of the most useful UFO cases are not the most mysterious ones. They are the cases where a sincere witness saw something striking, reported it carefully, and later investigation found a sky object: Venus, the Moon, or another bright star. That matters because it separates two questions that are often blurred together: whether a witness is honest, and whether the witness’s interpretation is right. In the Essonne files, those can be very different things. Overview image for Sky Mistakes

The Epinay-sous-Senart Venus observation

The Epinay-sous-Senart case is the best starting point because it contains the whole problem in miniature. On 23 and 25 August 1980, at around 3.30 in the morning, a witness observed from a fourth-floor home a very bright point of light in the eastern sky. On the second occasion the observation lasted about two hours, using binoculars, before the light gradually faded. GEIPAN’s published summary says no other witness was gathered by the gendarmerie, so the case depended heavily on one account, but the account was still detailed enough to test against the sky.[cnes-geipan.fr]cnes-geipan.frEPINAY-SOUS-SENART (91) 23.08.1980 | GEIPAN…

The important twist is that the case had not always sat comfortably in the “fully explained” box. GEIPAN notes that it had previously been treated under the name Boussy-Saint-Antoine and placed among older GEPAN cases classified C, meaning not identified because the available information was too thin. Yet even at the time, the Venus hypothesis had been considered probable. A later re-examination moved the case to classification A: a phenomenon identified after investigation.[cnes-geipan.fr]cnes-geipan.frEPINAY-SOUS-SENART (91) 23.08.1980 | GEIPAN…

What made Venus persuasive was not a vague “it was probably a star” dismissal. The reported characteristics matched a bright astronomical source: long duration, apparent stillness, small point-like form, eastern direction and a brightness that drew the witness’s attention at night. GEIPAN states that Venus was particularly visible at the time, with a magnitude of -4.26, and was present in the part of the sky being observed.[cnes-geipan.fr]cnes-geipan.frEPINAY-SOUS-SENART (91) 23.08.1980 | GEIPAN…

The most human sentence in the file is also the most useful for readers: GEIPAN explicitly says that the witness’s visual perception was not being challenged; the issue was the interpretation of the observation, influenced by factors such as night-time viewing and fatigue. That is a crucial distinction. It means the Epinay-sous-Senart case is not a story about gullibility. It is a story about how a real object can become strange when seen unexpectedly, at an unusual hour, from indoors, and without an immediate mental label.[cnes-geipan.fr]cnes-geipan.frEPINAY-SOUS-SENART (91) 23.08.1980 | GEIPAN… Sky Mistakes illustration 1

Why Venus becomes a UFO without doing anything unusual

Venus is a repeat offender in UFO archives because it is genuinely spectacular. Royal Museums Greenwich describes it as the second-brightest natural object in the night sky after the Moon, bright enough to be visible even in daylight under the right conditions. The same source notes that Venus near the horizon can twinkle and produce striking flashing colour effects, which are often reported as peculiar objects or UFOs.[Royal Museums Greenwich]rmg.co.ukRoyal Museums Greenwich Interesting facts about Venus | Royal Museums GreenwichRoyal Museums Greenwich Interesting facts about Venus | Royal Museums Greenwich

NASA’s skywatching guidance makes the same practical point: Venus is one of the sky objects most often confused with UFOs, especially when low near the horizon. NASA also notes that bright planets near the horizon can appear as strange lights, and recommends checking exact date, time, direction, brightness, duration and movement before deciding that a light is anomalous.[NASA Science]science.nasa.govScience Identifying UFOs and UAPsScience Identifying UFOs and UAPs

That fits Essonne particularly well because the department is full of partial viewing situations: flats, windows, roads, suburbs, dark rural stretches, and skies interrupted by trees, roofs, road signs and street lighting. A planet does not need to move in order to seem odd. The observer may move. Clouds may pass. Binoculars may amplify glare. A window frame may restrict the field of view. A tired witness may compare an isolated bright point with ordinary aircraft lights and find that it does not behave like an aircraft.

The Vigneux-sur-Seine case of 31 August 2010 shows this modern version of the same mechanism. At about 9 pm, a witness at dinner saw a very bright point through an open window, described it as a “little sun”, filmed it, and later made similar observations. GEIPAN classified the case A, with low strangeness and good consistency because videos were available, and identified it unambiguously as Venus.[cnes-geipan.fr]cnes-geipan.frVIGNEUX-SUR-SEINE (91) 31.08.2010 | GEIPAN…

The comparison between Epinay-sous-Senart and Vigneux-sur-Seine is revealing. One is an early-morning, binocular-assisted, single-witness case from 1980; the other is an evening domestic observation with video from 2010. In both, the core trigger is not fantasy but mismatch: the witness sees a very bright point where they do not expect such a bright point to be. The investigation changes the label from “unknown” to “Venus”, but it does not require the witness to have invented the event.

Low Moon and bright planet effects

The Moon seems too familiar to be mistaken for a UFO, but Essonne’s files show why it can still happen. GEIPAN’s case list includes Villebon-sur-Yvette on 6 September 1982, classified A as a red Moon. The brief listing alone is enough to show the pattern: an ordinary astronomical body can enter the archive when its colour, height or setting conditions make it look abnormal.[cnes-geipan.fr]cnes-geipan.frRecherche de cas | GEIPANRecherche de cas | GEIPAN

The more recent Briis-sous-Forges to Limours case, dated 1 January 2026, is especially useful because GEIPAN’s public summary lays out the mechanism in detail. A motorist travelling between the two Essonne communes saw a yellow-orange circular light, apparently low in the sky, with diffuse brightness and slightly irregular contours. It seemed to move at low altitude and then disappear below the horizon after less than a minute in the pre-dawn darkness. GEIPAN classified the case A as the Moon in its setting phase.[cnes-geipan.fr]cnes-geipan.frR] DE BRIIS-SOUS-FORGES (91) VERS LIMOURS (91) 01.01.2026 | GEIPAN…

Here again, the case is not explained by insulting the witness. GEIPAN judged the consistency of the file to be good, even though it rested on one testimony and had no exploitable recording, because the technical questionnaire, sketches and route reconstruction allowed the witness’s estimated direction and angles to be compared with astronomical and atmospheric data. The Moon was at about 309 degrees azimuth and very low on the horizon; clouds in that direction helped explain its rapid disappearance.[cnes-geipan.fr]cnes-geipan.frR] DE BRIIS-SOUS-FORGES (91) VERS LIMOURS (91) 01.01.2026 | GEIPAN…

The same file also explains why the Moon can appear to “follow” a moving vehicle. Because the Moon is enormously distant, its apparent position changes very little as the observer drives, while nearby landscape features move quickly across the field of view. That can create the impression of accompaniment, especially on a dark road when the witness is already trying to interpret a strange low light ahead.[cnes-geipan.fr]cnes-geipan.frR] DE BRIIS-SOUS-FORGES (91) VERS LIMOURS (91) 01.01.2026 | GEIPAN…

The wider astronomy is familiar but powerful. Timeanddate explains that the Moon can look larger near the horizon because of the Moon illusion, a psychological effect rather than a real increase in size; the surrounding landscape gives the brain misleading scale cues. The same source notes that the atmosphere changes the Moon’s colour and can flatten or distort it near the horizon through refraction. Those are exactly the sorts of effects that turn a known object into a reportable anomaly.[Time and Date]timeanddate.comTime and Date Why Does the Full Moon Look Bigger on the Horizon?Time and Date Why Does the Full Moon Look Bigger on the Horizon? Sky Mistakes illustration 2

Witness credibility versus mistaken interpretation

The most valuable lesson from the Essonne astronomy cases is that credibility and accuracy are not the same test. A credible witness can give a sincere, careful and useful account that still contains a mistaken interpretation. GEIPAN’s own classification method reflects this by separating “consistency” from “strangeness”: consistency concerns the quantity and reliability of information collected, while strangeness is what remains after comparison with known phenomena.[cnes-geipan.fr]cnes-geipan.frHow does GEIPAN classify observation cases? | GEIPANHow does GEIPAN classify observation cases? | GEIPAN

That distinction helps explain why some Essonne cases are strong as reports but weak as UFO mysteries. Vigneux-sur-Seine had videos and repeated observations, which improved the investigation; it was still Venus. Briis-sous-Forges to Limours had a good questionnaire, route reconstruction and directional estimates; it was still the setting Moon. Saint-Michel-sur-Orge in 2015, while just outside this page’s Moon-and-Venus centre, makes the same point with the star Arcturus: two people were intrigued by a coloured luminous phenomenon, one took photographs, and GEIPAN found that the star’s azimuth and elevation matched the reported direction closely.[cnes-geipan.fr+2cnes-geipan.fr]cnes-geipan.frVIGNEUX-SUR-SEINE (91) 31.08.2010 | GEIPAN…

For public UFO history, this is healthier than a simple believer-versus-sceptic split. A witness may be truthful about what was seen, but mistaken about distance, size, altitude or motion. Those are precisely the hardest things to judge for isolated lights in the night sky. A bright planet low on the horizon has no obvious scale. A low Moon behind cloud can look like a glowing object descending. A star near the horizon can shimmer and show colours in disturbed air.[Royal Museums Greenwich+2Time and Date]rmg.co.ukRoyal Museums Greenwich Planet Venus | Royal Museums GreenwichRoyal Museums Greenwich Planet Venus | Royal Museums Greenwich

This is why “honest mistake” should not be used as a polite synonym for “bad witness”. In these Essonne cases, the mistake is often what makes the report worth studying. It reveals the conditions under which normal sky objects become anomalous: night-time surprise, restricted viewpoint, low elevation, horizon haze, atmospheric shimmer, clouds, fatigue, and the absence of a ready comparison point.

What these cases change in Essonne’s UFO history

The Moon and Venus cases do not make Essonne’s UFO history empty. They make it more precise. Instead of treating every report as either mystery or fraud, they show a middle ground where a report is socially real, officially recorded, and ultimately explained. That is a large part of how a serious local UFO archive is built.

They also provide a useful caution for reading unresolved cases from the department. If a report describes a single bright light that remains in roughly the same part of the sky, appears near dawn or dusk, is seen close to the horizon, or seems to move only slowly, the first question should be astronomical: where were Venus, the Moon, Jupiter, Sirius or bright stars at that exact time and direction? That does not solve every case, but it prevents weak mysteries from being inflated before the basic sky has been checked. NASA’s practical advice follows the same logic: record date, time, location, direction, brightness, duration and apparent drift, then compare with known sky objects and tools such as planetarium software.[NASA Science]science.nasa.govScience Identifying UFOs and UAPsScience Identifying UFOs and UAPs

For Essonne specifically, the Epinay-sous-Senart file is the key example because it shows an older case being re-read in a more disciplined way. A case once left in a low-information category became a classification A case once the Venus hypothesis was properly tested against the reported conditions. The later Vigneux-sur-Seine file shows that better evidence does not always make a case stranger; sometimes video strengthens the ordinary explanation. The Briis-sous-Forges to Limours file shows the same principle applied to a recent Moon observation, with route reconstruction and sky position doing the work.[cnes-geipan.fr+2cnes-geipan.fr]cnes-geipan.frEPINAY-SOUS-SENART (91) 23.08.1980 | GEIPAN…

The result is a more respectful scepticism. The witness is not treated as dishonest. The sky is reconstructed. The claim is narrowed. The ordinary explanation is accepted only when it fits the timing, direction and appearance better than the alternatives. That is why Venus became an Essonne UFO, and why the explanation is not a debunking footnote but one of the department’s most useful lessons. Sky Mistakes illustration 3 <section class="further-reading-section" data-page-toc-exclude aria-labelledby="further-reading-title"><div class="fr-section-shell"><div class="fr-section-header"><div class="fr-section-heading"><p class="fr-section-kicker">Amazon book picks</p><h3 class="fr-heading" id="further-reading-title">Further Reading</h3></div><p class="fr-intro">Books and field guides related to Why Venus Became an Essonne UFO. Use these as the next step if you want deeper reading beyond the article.</p></div><div class="fr-books-grid"><article class="fr-book-card">Book<div class="fr-book-info"><h4 class="fr-book-title">UFOs</h4><p class="fr-book-author">By Leslie Kean</p><p class="fr-book-desc">Provides wider UFO context alongside identification debates.</p><div class="fr-book-actions"> See on Amazon</div></div></article><article class="fr-book-card">Book<div class="fr-book-info"><h4 class="fr-book-title">NightWatch</h4><p class="fr-book-author">By Terence Dickinson</p><p class="fr-book-desc">Directly helps readers identify Venus, the Moon, and other common sky objects.</p><div class="fr-book-actions"> See on Amazon</div></div></article><article class="fr-book-card">Book<div class="fr-book-info"><h4 class="fr-book-title">Turn Left at Orion</h4><p class="fr-book-author">By Guy Consolmagno, Dan M. Davis</p><p class="fr-book-desc">Explains what observers actually see through the night sky.</p><div class="fr-book-actions"> See on Amazon</div></div></article><article class="fr-book-card">Book<div class="fr-book-info"><h4 class="fr-book-title">The Demon-haunted World</h4><p class="fr-book-author">By Carl Sagan</p><p class="fr-book-desc">Explores critical thinking and mistaken interpretations of unusual phenomena.</p><div class="fr-book-actions"> See on Amazon</div></div></article></div><div class="fr-section-footer"><div class="fr-browse-links" aria-label="Browse more on Amazon">Browse more on Amazon:UFOs NightWatch Turn Left at Orion</div><p class="fr-disclosure">As an Amazon Associate I earn from qualifying purchases.</p></div></div></section><section class="further-reading-section" data-page-toc-exclude data-ebay-localized-links data-ebay-visual-market="EBAY_GB" aria-labelledby="merchant-block-title"><div class="fr-section-shell"><div class="fr-section-header"><div class="fr-section-heading"><p class="fr-section-kicker">eBay marketplace picks</p><h3 class="fr-heading" id="merchant-block-title">Marketplace Samples</h3></div><p class="fr-intro">Live-tested eBay searches with available results related to this page.</p><div class="fr-ebay-market-toolbar">Shop location<div class="fr-ebay-market-picker">UsingUSA<div class="fr-ebay-market-menu" data-ebay-market-menu role="listbox" hidden></div></div></div></div><div class="fr-ebay-market-panel" data-ebay-market-panel="EBAY_GB" data-ebay-market-default="1"><div class="fr-books-grid"><article class="fr-book-card"><div class="fr-book-info"><p class="fr-book-kicker">Example eBay listing</p><h4 class="fr-book-title">UFO Over Forest Framed Wall Art Poster Canvas Print Picture</h4>SearcheBay.co.uk: UFO art print<div class="fr-book-actions"> Browse similar oneBay.co.uk</div></div></article><article class="fr-book-card"><div class="fr-book-info"><p class="fr-book-kicker">Example eBay listing</p><h4 class="fr-book-title">UFO DIGITAL ART PRINT A4 SKY1 Gerry Anderson 1970s UK from my original drawing</h4>SearcheBay.co.uk: UFO art print<div class="fr-book-actions"> Browse similar oneBay.co.uk</div></div></article><article class="fr-book-card"><div class="fr-book-info"><p class="fr-book-kicker">Example eBay listing</p><h4 class="fr-book-title">UFO Art Print Victorian Alien Invasion Encounter War of Worlds Style Wall Decor</h4>SearcheBay.co.uk: UFO art print<div class="fr-book-actions"> Browse similar oneBay.co.uk</div></div></article><article class="fr-book-card"><div class="fr-book-info"><p class="fr-book-kicker">Example eBay listing</p><h4 class="fr-book-title">Ufo Art Print (ufo at sundown)</h4>SearcheBay.co.uk: UFO art print<div class="fr-book-actions"> Browse similar oneBay.co.uk</div></div></article></div><div class="fr-section-footer"> Browse more oneBay.co.uk<p class="fr-disclosure">Example items shown for inspiration; availability and pricing can change. Branchoria may earn a commission if you purchase through outbound eBay links.</p></div></div></div></section>

Endnotes

1. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/cas/1980-08-01688

<summary>Source snippet</summary><p>EPINAY-SOUS-SENART (91) 23.08.1980 | GEIPAN…</p>

2. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/cas/2010-08-02759

<summary>Source snippet</summary><p>VIGNEUX-SUR-SEINE (91) 31.08.2010 | GEIPAN…</p>

3. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/cas/2026-01-51730

<summary>Source snippet</summary><p>[R] DE BRIIS-SOUS-FORGES (91) VERS LIMOURS (91) 01.01.2026 | GEIPAN…</p>

4. Source: cnes-geipan.fr
Title: Recherche de cas | GEIPAN
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=1&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_classification_des_cas&page=29&select-category-export=nothing&sort=asc&video=on

5. Source: cnes-geipan.fr
Title: How does GEIPAN classify observation cases? | GEIPAN
Link:https://www.cnes-geipan.fr/en/node/412

6. Source: science.nasa.gov
Title: Science Identifying UFOs and UAPs
Link:https://science.nasa.gov/solar-system/skywatching/night-sky-network/identifying-ufos-and-uaps/

7. Source: timeanddate.com
Title: Time and Date Why Does the Full Moon Look Bigger on the Horizon?
Link:https://www.timeanddate.com/astronomy/moon/horizon.html

8. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/cas/2015-08-09270

9. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?customGetLattitude=45.735486641128446&customGetLongitude=-0.615234375&customGetZoom=5&field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=54.52108149544362&field_latitude_value%5Bmin%5D=36.94989178681327&field_longitude_value%5Bmax%5D=14.326171875000002&field_longitude_value%5Bmin%5D=-15.556640625000002&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_departement_textuel&page=120&sort=desc

10. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/temoignage/3158

11. Source: cnes-geipan.fr
Title: Notes d’enquete50
Link:https://www.cnes-geipan.fr/sites/default/files/Notes%20d%27enquete50.pdf

12. Source: cnes-geipan.fr
Title: Questionnaire terre R78
Link:https://www.cnes-geipan.fr/sites/default/files/Questionnaire%20terre-R78.pdf

13. Source: cnes-geipan.fr
Title: export cas pub 20251127093552.csv
Link:https://www.cnes-geipan.fr/sites/default/files/save_json_import_files/export_cas_pub_20251127093552.csv

14. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/en/recherche/cas/tab?field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=1&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_departement_textuel&page=38&select-category-export=nothing&sort=asc&video=on

15. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=&field_classification_des_cas_target_id%5B0%5D=11&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date_d_observation&page=3&sort=asc

16. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/en/recherche/cas/tab?field_agregation_index_value=&field_classification_des_cas_target_id%5B11%5D=11&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_departement_textuel&page=36&sort=desc

17. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/recherche/cas/tab?field_date_value=2007-03-01&field_is_revisited_value=All&field_type_de_cas_target_id=All&order=field_departement_textuel&page=39&sort=asc

18. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=1&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date_d_observation&page=138&select-category-export=nothing&sort=desc&video=on

19. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/en/recherche/cas/tab?field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_departement_textuel&page=127%2C35&sort=desc&undefined=

20. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_type_de_cas_target_id=All&order=field_phenomene_textuel&page=0&sort=desc

21. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=&field_classification_des_cas_target_id%5B11%5D=11&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=50.708634400828224&field_latitude_value%5Bmin%5D=31.765537409484374&field_longitude_value%5Bmax%5D=20.22890244005691&field_longitude_value%5Bmin%5D=-5.127542872443095&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date_d_observation&page=3%2C12&select-category-export=nothing&sort=asc

22. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=&field_classification_des_cas_target_id%5B0%5D=11&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date_d_observation&page=42%2C1&sort=desc

23. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/sites/default/files/Compte%20rendu%20enquete94.pdf

24. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=orange&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date&page=21%2C0&sort=asc

25. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/cas/1982-09-00941

26. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/temoignage/7433

27. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/temoignage/10615

28. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/temoignage/8782

29. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/en/recherche/cas/tab?field_agregation_index_value=lune&field_classification_des_cas_target_id%5B0%5D=11&field_classification_des_cas_target_id%5B1%5D=12&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_classification_des_cas&page=%2C13&select-category-export=nothing&sort=asc

30. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?customGetLattitude=46.94358292648825&customGetLongitude=4.4989013671875&customGetZoom=7&field_agregation_index_value=&field_classification_des_cas_target_id=All&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=49.11702904077932&field_latitude_value%5Bmin%5D=44.77013681219717&field_longitude_value%5Bmax%5D=7.668457031250001&field_longitude_value%5Bmin%5D=1.329345703125&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date&page=34%2C10&sort=desc

31. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=Ain&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_classification_des_cas&page=8%2C37&sort=asc

32. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?customGetLattitude=43.9503570933062&customGetLongitude=-3.31787109375&customGetZoom=5&field_agregation_index_value=&field_classification_des_cas_target_id%5B0%5D=11&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=53.014783245859235&field_latitude_value%5Bmin%5D=34.88593094075317&field_longitude_value%5Bmax%5D=8.920898437500002&field_longitude_value%5Bmin%5D=-15.556640625000002&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_classification_des_cas&page=15&sort=desc

33. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=06&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_type_de_cas_target_id=All&order=field_date&page=%2C30&sort=desc

34. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?customGetLattitude=35.188709584047814&customGetLongitude=-33.92578125&customGetZoom=3&field_agregation_index_value=&field_classification_des_cas_target_id%5B11%5D=11&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=70.72897946208789&field_latitude_value%5Bmin%5D=-0.3515602939922709&field_longitude_value%5Bmax%5D=25.839843750000004&field_longitude_value%5Bmin%5D=-93.69140625&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date&page=18&sort=asc

35. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_valu_valu=04-23&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date_d_observation_textuel&page=161%2C0&sort=desc

36. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/en/recherche/cas/tab?field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_phenomene_textuel&page=2%2C37&sort=asc

37. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/en/recherche/cas/tab?field_agregation_index_value=lune&field_classification_des_cas_target_id%5B0%5D=11&field_classification_des_cas_target_id%5B1%5D=12&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date_d_observation&page=%2C1&select-category-export=nothing&sort=asc

38. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?customGetLattitude=45.735486641128446&customGetLongitude=-0.615234375&customGetZoom=5&field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=54.52108149544362&field_latitude_value%5Bmin%5D=36.94989178681327&field_longitude_value%5Bmax%5D=14.326171875000002&field_longitude_value%5Bmin%5D=-15.556640625000002&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date_d_observation&page=79&sort=desc

39. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?field_is_new_value=All&field_is_revisited_value=All&field_type_de_cas_target_id=All&order=field_date_d_observation_textuel&page=6&sort=asc

40. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_phenomene_textuel&page=2%2C30&sort=asc

41. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/en/recherche/cas/tab?field_agregation_index_value=&field_classification_des_cas_target_id%5B0%5D=11&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date_d_observation&page=41%2C30&sort=desc

42. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/en/recherche/cas/tab?field_agregation_index_value=&field_classification_des_cas_target_id%5B11%5D=11&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_phenomene_textuel&page=%2C8&sort=desc

43. Source: cnes-geipan.fr
Link:https://cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=2021-06-26&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=1&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_departement_textuel&page=4%2C1&sort=asc

44. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=c&field_is_new_value=All&field_is_revisited_value=All&field_type_de_cas_target_id=All&order=field_date_d_observation_textuel&page=93&sort=desc

45. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/en/recherche/cas/tab?customGetLattitude=46.124763699209396&customGetLongitude=2.406005859375001&customGetZoom=6&field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=50.52739681329302&field_latitude_value%5Bmin%5D=41.72213058512578&field_longitude_value%5Bmax%5D=8.745117187500002&field_longitude_value%5Bmin%5D=-3.9331054687500004&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_classification_des_cas&page=127&sort=desc&undefined=

46. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?field_date_value=2025-02-25&field_is_new_value=1&order=title&page=%2C8&sort=desc

47. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=c&field_is_new_value=All&field_is_revisited_value=All&field_type_de_cas_target_id=All&order=field_classification_des_cas&page=122&sort=desc

48. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/fr/recherche/cas/tab?field_agregation_index_value=&field_classification_des_cas_target_id%5B11%5D=11&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=1&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=116&order=field_date&page=%2C14&select-category-export=nothing&sort=desc&video=on

49. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/en/recherche/cas/tab?field_agregation_index_value=Photo&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=&field_latitude_value%5Bmin%5D=&field_longitude_value%5Bmax%5D=&field_longitude_value%5Bmin%5D=&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_classification_des_cas&page=9%2C34&sort=asc

50. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/en/node/58788

51. Source: cnes-geipan.fr
Link:https://www.cnes-geipan.fr/en/missions-methodes-et-resultats

52. Source: cnes-geipan.fr
Title: 03 ROSPARS full
Link:https://www.cnes-geipan.fr/sites/default/files/03_ROSPARS_full.pdf

53. Source: timeanddate.com
Link:https://www.timeanddate.com/astronomy/moon/super-full-moon.html

54. Source: cnes.fr
Link:https://cnes.fr/en/projects/geipan

55. Source: nightsky.jpl.nasa.gov
Link:https://nightsky.jpl.nasa.gov/news/39/

56. Source: science.nasa.gov
Title: the moon illusion why does the moon look so big sometimes
Link:https://science.nasa.gov/solar-system/moon/the-moon-illusion-why-does-the-moon-look-so-big-sometimes/

57. Source: youtube.com
Link:https://www.youtube.com/watch?v=zczcBLukQ6s

58. Source: youtube.com
Link:https://www.youtube.com/watch?v=P-ymwG9mDhE

<summary>Source snippet</summary><p>GEIPAN: Behind the scenes of the organization that studies unidentified aerospace phenomena…</p>

59. Source: rmg.co.uk
Title: Royal Museums Greenwich Interesting facts about Venus | Royal Museums Greenwich
Link:https://www.rmg.co.uk/stories/space-astronomy/interesting-facts-about-venus

60. Source: rmg.co.uk
Title: Royal Museums Greenwich Planet Venus | Royal Museums Greenwich
Link:https://www.rmg.co.uk/stories/space-astronomy/planet-venus

61. Source: darkskydiary.wordpress.com
Title: the moon illusion
Link:https://darkskydiary.wordpress.com/2011/03/09/the-moon-illusion/

62. Source: Wikipedia
Link:https://en.wikipedia.org/wiki/GEIPAN

63. Source: wral.com
Link:https://www.wral.com/archive/20716858/

64. Source: space.com
Link:https://www.space.com/stargazing/junes-full-strawberry-moon-illuminates-the-night-sky-next-week-heres-how-to-see-it

65. Source: space.com
Title: 14884 jupiter venus mistaken ufos
Link:https://www.space.com/14884-jupiter-venus-mistaken-ufos.html