Hi Steve,
A bit more information needed.
Do you see this for all the satellites, or just one? Which Keplerians are you using in SatPC32? Celestrak or AMSAT? Is the difference consistent with one source always early? Do you have a minimum elevation selected in SatPC32?
73s,
Alan WA4SCA
<-----Original Message----- <From: [email protected] [mailto:[email protected]] On Behalf Of Steve May <Sent: Sunday, November 23, 2014 10:05 AM <To: [email protected] <Subject: [amsat-bb] Gold Standard for Keplerian Data < <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