Constellation:Stars that form pattern.
Celestial sphere:Locate stars and planets.
Celestial Coordinate System:Mapping position.
Celestial Equator: Main celestial line.
Longitude:East and west measure on earth.
Latitude: North and south measurement.
Declination: Coordinate used on the celestial sphere.
Right Declension: Longitude is used on earth.
Vernal Equinox:Position of the sun.
Celestial pole:They are located over the north and south pole.