Wanting to feel I'd actually accomplished something, I decided to make a very tiny piece of the telescope Addon available.
siderealclock.zip
(34KB, expands to ~100KB)
It displays the current sidereal time at its location within Celestia. Sidereal time is defined to be the hour angle of the vernal equinox. Operationally, that means it's the Right Ascension of an object that's precisely overhead.
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