* Right Ascension (RA): Similar to longitude on Earth, this measures the angular distance of an object eastward along the celestial equator from the vernal equinox (a specific point in the sky). It is measured in hours, minutes, and seconds, with 24 hours corresponding to a full circle.

* Declination (Dec): Similar to latitude on Earth, this measures the angular distance of an object north or south of the celestial equator. It is measured in degrees, minutes, and seconds, with +90 degrees being the North Celestial Pole and -90 degrees being the South Celestial Pole.

Together, Right Ascension and Declination form a celestial coordinate system that uniquely identifies the position of any object in the sky.