Romain Fafet replied to the topic 'Satellite confusion' in the forum. 7 years ago

The computer date is used for the tracking. If you want to simulate the tracking for an other date you can add a bias by changing this line:

obs.date = ephem.now()
in
obs.date = ephem.now() + 4*ephem.hour + 40*ephem.minute
for an event 4h40 in the future

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