a grid system for locating things in the sky. It's anchored to the celestial poles and the celestial equator (directly above Earth's equator). Declination and right ascension are the celestial equivalents of latitude and longitude.
A way of describing the positions of the stars in the sky. The celestial coordinates RA and Dec note position along and off the ecliptic, respectively.
the grid system similar to latitude and longitude used to locate objects on the celestial sphere