I am using an Android app and the USNO web site. The USNO web site is using server side scripting so there is a few 100mS delay. Considering this small delay, they match very well but the app is more convenient so I have been using that as my reference, checking it periodically against USNO. Without knowing any better, I would like to think the USNO is probably right.
I have seen a couple other calculators but they have some offset and they do not publish their code. The one Tom sent me the link for is accessible on line. The web site where it is hosted produces results that are off by a significant amount (minutes) compared to the USNO, but the GMST calculation is using a very similar formula to what I am using. It could be that the server time is off, not every web server has NTP running. I have made an attempt to compare the results after converting the JavaScript to C but I must have a bug in my conversion as it's just broken at the moment. I have not found yet how to tell Lady Heather to display sidereal time but have not looked very hard, that will be for today. As of this morning, my implementation is still off by 57 seconds, so at least it is consistent. On Sat, Jan 19, 2019, 5:02 AM Mark Sims <[email protected] wrote: > When I was playing with the sidereal time code I found lots of buggy/bogus > implementations and also lots of web calculators that were either totally > wrong or off by some amount. Same for sunrise/sunset code and > equation-of-time code. It's hard to know what code / sites you can > trust. Heather could be off... > > A lot of the web based ones seemed to have their system clocks not all > that accurate. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
