A light version for older browsers. It uses plain HTTP, loads no outside files, and needs no modern features. The full site is at index.html.
Pick a scenario and a distance. The readouts show how fast the light would really be moving at that distance. The angle across the sky stays the same, but the speed grows with distance.
Pick a distance first, then check your guess.
Answer what you can. Leave the rest on Not sure. This ranks ordinary explanations to check first and does not decide what it was.
The astronomer J. Allen Hynek, a consultant to the US Air Force's Project Blue Book, laid out a scheme in his 1972 book The UFO Experience. It sorts reports by what was seen, not by what it was.
NLLights in the night sky with no visible body. The most common kind of report.
DDObjects seen by day, often described as discs, ovals or eggs.
RVA radar return that matches something seen by eye. Two sensors help, though radar has false returns of its own.
CE1A sighting within about 150 m (500 ft). That distance is a rule of thumb.
CE2Physical effects reported: scorched ground, stalled engines, interference.
CE3Occupants reported. Later writers added a fourth kind for abduction claims. Hynek's own scheme stopped at three.
Well-known cases in date order. Explained means an official or well-supported finding. Disputed means credible explanations exist but people still disagree. Unresolved means the case is officially open. Programme marks government efforts to study the subject.
Multiply seven guesses together to estimate how many civilisations in our galaxy might be sending detectable signals right now.
Spot lights in the sky, lock on, read the instruments and file what each one is. It is a 3D game, so it needs a browser with WebGL. It opens on its own page.