Sidereal Astrology is a system that measures the positions of the planets against the backdrop of the actual constellations in the sky. Unlike Tropical Astrology, which is based on the Earth's ...

Slightly less than the 24 hours of a solar day (23 hours, 56 minutes, 4.1 seconds). Used in astronomy, sidereal means "when a star crosses the meridian" (the meridian is an imaginary circle around ...