Sattelite transmission would take at least 540 ms (read:.54 sec), at least 270 going up, and at least 270 coming down. Geez, I knew that data communications class would come in handy one day!;-)
Did that comms class discuss the altitude of that bird to get those delays... a geo-synch and your times are close enough.. for a low earth orbit.. it would be less.
Now you have set the kid on the path to become a VP in SCO/Caldera.