Concept
Right Ascension
Celestial longitude, measured eastward in hours.
The angular distance of a celestial object measured eastward along the celestial equator from the vernal equinox, in hours/minutes/seconds.
Overview
The angular distance of a celestial object measured eastward along the celestial equator from the vernal equinox, in hours/minutes/seconds.
See also
Declination
Celestial latitude, measured in degrees.
Sidereal Time
Time measured by the stars rather than the Sun.
Solar Time
Time measured by the Sun's position.
Epoch (Astronomy)
A reference instant for celestial coordinates.
The Big Bang
How everything began, 13.8 billion years ago.
Black Holes
Regions where gravity stops light itself.