Steve,
There is only one gold source for kep data.
https://www.space-track.org/auth/login
Every other kep source is subject to being old as they get their data from space-track every so often.
It is very easy to access this data directly. If you really care try either of these methods.
http://www.tomdoyle.org/TleTools/TleToolsBasic.html
http://www.celestrak.com/SpaceTrack/TLERetriever3Help.asp
I do not know how they obtain the kep data for the AMSAT web site but I would guess they use the AMSAT list and as a result their data is often old.
It has always been a mystery to me why more people do not go directly to the source of TLE data. Perhaps it is a just a case of "BUT WE HAVE ALWAYS DONE IT THAT WAY - SO THERE !".
73 W9KE Tom Doyle
On Sun, Nov 23, 2014 at 10:04 AM, Steve May [email protected] wrote:
I have noticed that when I update the Keplerian Data for my location on SatPC32 and generate a list of passes they all seem to be about 5 minutes different than the predictions from the AMSAT website. This is for the earliest pass, and I am using the exact GPS coordinates for my location.
So which do I rely on? Which predictions should I consider the "gold standard" for passes?
Steve, W5IEM _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb