Concept
Solar Time
Time measured by the Sun's position.
Time based on the Sun's apparent motion through the sky; a solar day averages 24 hours.
Overview
Time based on the Sun's apparent motion through the sky; a solar day averages 24 hours.
See also
Heliopause
The edge of the Sun's bubble in space.
Right Ascension
Celestial longitude, measured eastward in hours.
Declination
Celestial latitude, measured in degrees.
Ecliptic
The Sun's apparent annual path across the sky.
Sidereal Time
Time measured by the stars rather than the Sun.
The Big Bang
How everything began, 13.8 billion years ago.