Concept
Sidereal Time
Time measured by the stars rather than the Sun.
Timekeeping based on Earth's rotation relative to the stars; a sidereal day is about 23h 56m 4s.
Overview
Timekeeping based on Earth's rotation relative to the stars; a sidereal day is about 23h 56m 4s.
See also
Exoplanets
Worlds orbiting other stars.
Stellar Life Cycle
How stars are born, live, and die.
Reionization Epoch
When the first stars and galaxies relit the universe.
Stellar Nucleosynthesis
Stars forging the chemical elements.
Moving Group
Stars sharing a common motion through the galaxy.
Right Ascension
Celestial longitude, measured eastward in hours.