[MortonH]

Yesterday SS (Android basic version) predicted that the GRS would be central around 8:30pm and that Callisto would begin a transit around the same time.

When I actually observed it last night I noticed that Callisto didn't begin to pass in front of Jupiter until at least 30 minutes after SS showed the event starting.

I checked my location and time settings and even swapped between using the GPS setting and manually selecting Sydney - no change.

Is this normal or do we expect SS to be more accurate with its timings?

I didn't think to compare it with my Mac version.