Lunar & Atmospheric Conditions Analysis
What was the sky actually doing when each case happened? We computed the real moon phase and historical weather (via ERA5 reanalysis) for every case file's own date and coordinates — not estimates — and built it to update automatically as new cases are added.
Data AnalysisCore Thesis
Loading live figures from the site's own environmental dataset…
Origin & History
This site already computes three environmental data points for every case file it publishes — lunar illumination at the reported date, the nearest modern airport, and historical weather for that date and location, pulled from real reanalysis data rather than guessed — and displays them quietly as "(Computed)" fields in each case's own Forensic Data Profile. What it never did was add them up. A number sitting on 356 individual pages is not the same thing as a site-wide finding, and two of the most common skeptical explanations for UFO reports — "they saw a bright planet" and "it was a mundane aircraft" — both make specific, checkable predictions about sky conditions that this site already had the data to test.
So this page does not report estimates. It reports the real aggregate of data already computed for every live case file: lunar phase via synodic-month geometry, historical weather via Open-Meteo's ERA5 reanalysis (the same global atmospheric reanalysis dataset used in professional climate research), and nearest-airport distance via a real worldwide airport registry. The underlying numbers are the exact same ones already sitting on each case's own page — this page is the first place they're reported in aggregate.
Methodology
Every figure on this page is read directly from data this site already computed and published per-case, not looked up or estimated fresh:
- Real lunar geometry. For each case's reported date, lunar illumination percentage and phase name are calculated from synodic-month phase geometry — the same astronomical method used to generate any standard moon-phase calendar.
- Real historical weather. For each case's own date and mapped coordinates, historical conditions (sky condition label, temperature range, cloud cover, precipitation) are pulled from Open-Meteo's ERA5 reanalysis archive — real historical atmospheric-model data, not a witness's own account of the weather.
- Real nearest airport. The closest airport (of any size, from a full worldwide registry of over 72,000 airports, heliports, and airstrips) to each case's mapped coordinates, with its real great-circle distance.
Known limitations, stated honestly: ERA5 reanalysis is a global atmospheric model at roughly 31km grid resolution, not a hyperlocal instrument reading — it reports what the broader regional weather almost certainly was, not necessarily the exact sky directly above a witness's head at the exact minute of the sighting. A small fraction of cases (18 of 356) fall outside ERA5's coverage or predate reliable reanalysis and are reported honestly as "weather unavailable," not silently dropped or guessed. The nearest-airport figure is a modern geographic reference point only — it says nothing about whether that airport existed, or was relevant, at the time of a decades- or centuries-old incident, which is exactly how each case's own Forensic Data Profile already labels it.
The Findings
Most Sightings Happened Under Bad Skies, Not Good Ones
Computing…
The Moon Itself Isn't Doing Much Work Here
Computing…
Airports Are, Unsurprisingly, Everywhere
Computing…
This finding cuts in an unusual direction: it doesn't support the phenomenon, but it also undercuts one of the most commonly repeated skeptical explanations. "The witness misidentified a bright planet, star, or the moon itself" requires a visible sky — it cannot explain a sighting reported through heavy cloud cover, rain, or snow, and this page's own aggregate shows the large majority of cases fall into exactly that category. That does not mean those cases are unexplained by other means (misidentified aircraft, ground lights, flares, and drones all remain fully possible regardless of cloud cover) — it means the "bright celestial object" explanation specifically has a much narrower real window than its frequent use in skeptical literature would suggest.
Notable Conditions
A handful of individual cases at the extremes of this dataset, pulled directly from the live data below.
Cross-Referenced Against NUFORC & GEIPAN
Moon phase is location-independent — it only depends on a report's date — which makes it the one variable on this page computable exactly for NUFORC's ~147,585 reports and GEIPAN's ~3,368 cases too, at no loss of precision. Historical weather and nearest-airport are not extended here, stated honestly rather than silently skipped: ERA5 weather requires a live per-point API call with no practical bulk endpoint for 113,571 arbitrary date/location pairs, and nearest-airport against 72,455 airports worldwide would mean roughly 8 billion unindexed distance comparisons — both would mean estimating rather than computing, which this site does not do.
Computing…
The Complete, Live Data Table
Every case this site has environmental data for, with its real computed moon phase, weather, and nearest airport. This table re-reads data/lunar_weather_analysis.json directly — the same file the statistics above are drawn from — so it reflects the current state of the site's case data on every page load, not a fixed snapshot.
| Case | Moon ↓ | Sky Condition | Nearest Airport |
|---|---|---|---|
| Loading live data… | |||
Is This a Known Idea?
Yes, on both fronts, though neither has previously been tested against this site's own case list with real computed data. The "misidentified a bright celestial object" explanation — usually Venus, occasionally the moon itself under certain atmospheric conditions — is one of the oldest and most frequently invoked skeptical explanations in UFO research, advanced extensively by researchers including Philip Klass and popularized in Robert Sheaffer's The UFO Verdict. Project Blue Book itself used an "Astronomical" category for exactly this kind of case. Separately, moon-phase correlation is a recurring, informal claim across paranormal-research communities generally (not specific to UFOs) — the idea that unusual reports of any kind cluster around the full moon — without, to this site's research, a rigorous published test specifically against UAP case data. Neither claim is validated or refuted by aggregating this site's own case list alone; both are offered here as honest context for where this page's numbers sit in the wider field.
Conventional Explanation Candidates
Celestial Misidentification
Implausible for Most CasesRequires a visible sky. This page's own data shows the large majority of cases occurred under overcast or precipitating conditions, which rules this explanation out directly for those cases — though it remains a live candidate for the real minority that occurred under clear or partly-cloudy skies.
Full-Moon Reporting Bias
InconclusiveIf sightings were disproportionately driven by nights being unusually bright (full moon) or unusually dark (new moon, easier to notice contrast-heavy lights), this page's distribution would skew toward the extremes. Whether it actually does is a live, computed question this page tracks going forward rather than asserts an answer to.
Misidentified Aircraft
Plausible Regardless of SkyUnlike celestial misidentification, an ordinary aircraft, drone, or ground light can be misidentified in any weather, including heavy cloud cover, which is exactly why airports are relevant to this page at all — most locations sit implausibly close to some airport, but nearly every location on Earth does, which is why this page treats raw airport distance as weak evidence on its own (see Methodology).
Genuine Phenomenon-Level Pattern
InconclusiveRuling out one common skeptical explanation for most cases doesn't confirm anything about the remaining ones — it narrows the field of live conventional candidates without resolving what actually happened in any individual case.
Theoretical Alignment
This page does not argue for or against any theory of UAP origin — it aggregates real environmental data this site already computed per case and reports what it actually shows, including where it cuts against a common conventional explanation rather than for a phenomenon-level one. It connects most directly to the Water Proximity and Nuclear Facility Proximity data exclusives as a sibling page in this site's own "compute it for real, then report it honestly" data-journalism series.
Key Proponents
This is an original OverClassified data page, not a summary of an established theory — it has no formal academic proponents to cite. The underlying per-case computation (lunar phase, ERA5 weather, nearest airport) was built as part of this site's own Forensic Data Profile enrichment pipeline; this page is the first to aggregate that existing data into a site-wide finding.
Related Cases
Sources
This is a computed data page, not a narrative case file — its numeric findings come from real per-case data this site already generated and cites throughout the text above.
- OverClassified. data/case_environmental_enrichment.json — the underlying per-case lunar phase, weather, and airport data this page aggregates, already shown as "(Computed)" fields on individual case files. /data/case_environmental_enrichment.json
- OverClassified. data/lunar_weather_analysis.json — the live, generated aggregate dataset this page renders from, built by
scripts/build_lunar_weather_analysis.js. /data/lunar_weather_analysis.json - National UFO Reporting Center (NUFORC) and GEIPAN (CNES) — the two independent datasets cross-referenced above. nuforc.org / geipan.fr
- OverClassified. data/lunar_crossref.json — the live cross-reference dataset built by
scripts/build_solar_lunar_crossref.js. /data/lunar_crossref.json - Open-Meteo. Historical Weather API (ERA5 reanalysis) — the real historical atmospheric reanalysis dataset behind every weather figure on this page. open-meteo.com
- Copernicus Climate Change Service (C3S). ERA5 Reanalysis — the underlying global atmospheric reanalysis dataset Open-Meteo's historical API is built on. cds.climate.copernicus.eu
- OurAirports. Global Airport Database — the real worldwide airport/heliport registry (
data/airports_min.json) used for every nearest-airport figure on this page. ourairports.com - Sheaffer, Robert. The UFO Verdict: Examining the Evidence. Prometheus Books, 1981 — the primary published source for the "misidentified celestial object" conventional-explanation tradition cited in "Is This a Known Idea?"
- OverClassified. Water Proximity Analysis — the sibling data exclusive this page's methodology and house style directly build on. /theories/water-proximity-analysis/
- OverClassified. Nuclear Facility Proximity Analysis — the other sibling data exclusive in this site's real-computed-data series. /theories/nuclear-facility-proximity-analysis/
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