Sigh.. Replying to: It refers to rotation relative to rest of Earth;the differential~1°/yr I read -- InTheNameOfJesus Post ReplyForum sinbad 02/14/2023, 10:45:15 Author Profile | Edit Recommend | Alert | 5 4 3 2 1 0 -1 -2 -3 -4 -5 Where am IGo Up Go TopPost ReplyBack