I'm 8 hours from Greenwich, why is my sidereal time 10 minutes different from theirs? In order to write and run the script in this answer
I typed &quot;Greenwich sidereal time right now?&quot; into google (or at least tried to) and got two numbers.
Greenwich sidereal time was 09:51:07 but my local sidereal time was ten minutes earlier at 09:40:50.
I'm in UTC +8 so the ten minute difference is not because I'm ~8 hours away.
What causes this small difference in sidereal times?
I don't think the Google Search is passing any coordinates to the Heavens Above website to get the results the Search is displaying.
If you click through on the provided link in the search, Heavens Above gives the following default location:

Location:   Bristol
(51.4770°N, 2.5690°W)
Since Bristol is 2.57° West of the Greenwich Meridian, its Local Sidereal Time is about 10 minutes earlier than Greenwich.