Orbital
Illumination
Screen
Earth-shadow geometry · satellite & debris flare screening
Field tool · geometric model
Screens one hypothesis only
When & where
Date of sighting (local)
Local time
UTC offset
Enter the offset actually in force that night, daylight saving included. Arizona is −7 year round; most of the US is −4 to −7.
Latitude °
Longitude °
West longitude is negative. Use the witness's position, not the nearest town centre.
Where the object was
Elevation above horizon °
Arm extended: fist ≈ 10°, open hand span ≈ 20°, three fingers ≈ 5°, thumb ≈ 2°.
Compass bearing °
Mag. declination °
Enter the bearing as read. Add declination only if the reading came from a magnetic compass — east is positive. Leave at 0 for a true bearing.
Behaviour (optional)
Seconds to cross one fist-width (10°)
A very large number, or blank, means it appeared to hold still.
Reported characteristics
Blinking, strobing, or coloured lights
Any sound heard
Stopped, hovered, turned, or reversed
Visible longer than 15 minutes in one spot
Faded out, then came back
Reddened or turned orange before fading
Run screen
Load example case