Comparing predictions using HeavensAbove, and, eg Heavensat, the predicted track and times seem to vary widely. For example, a pass of the ISS this evening is predicted by HeavensAbove to pass through Cassiopeia, whereas Heavensat shows it passing outside the constellation, to the north. The timing by HeavensAbove is given as 1757 - 1803, whereas Heavensat gives me 1757 - 1806. This latter could be due to different definitions of elevation. However the track is very different. Fine for visual obs, but rather problematic for precise telescope/camera pointing. Or am I missing something? Joe ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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