[time-nuts] Calculating sidereal time

[Mark Sims]

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.