*U* UFO Database: Astronomical ClockThis Astronomical Clock displays planetary positions in different coordinates systems
The display was captured from a realtime screen in the original DOS *U* application.
One keystroke converts the display to "Hypothetical Mode" where realtime data is replaced by the last UFO record accessed from the database. Time and coordinates can be tweeked to test theories out.
It is interesting to see where Venus and Mars show up, and when they are below the horizon. Some famous UFO sightings were de-confirmed this way. Some overly convenient Venus explanations were refuted as well.
It is fun to track planets in realtime, confirming their positions visually.