So, sidereal time is defined as the right ascension of a “star” (real or imagined) which lies on your local meridian. Sidereal time is not like time zones, where an entire area has the same time.

Sidereal time (left) is measured with respect to background stars while solar time references the Sun. Earth needs to rotate nearly an extra degree for the Sun to pass the reference point; this ...

Understanding the difference in time-keeping when we use sidereal days instead of solar days.

Sidereal year: The time necessary for the Earth to make one complete revolution around the sun; 365 days, 6 hours 9 minutes, 9.5 seconds. The calendar year is 365 days, and 366 days every fourth year.

OBSERVATORY practice in the past has always been to use separate clocks for indicating solar and sidereal time. In the case of quartz crystal clocks, this practice could be continued by using two ...