PLANET WATCHER
Brilliant Software 1983 . Perryer
and a modern ephemeris, side by side
Date Time(UT)
Latitude Long.
 
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L Use my location
R Repair line 238 : ON
B Back to the program
A The archive: disc, manual, source
The 1983 column is the program's own
algorithm and orbital elements, run
for tonight. The white column is the
Astronomy Engine, checked against
NASA JPL Horizons, June 2026.
(Press "B" to return to the program)