celestial equator noun (astronomy)

A great circle in which the plane of the earth's equator cuts the celestial sphere

celestial globe noun

A model of the celestial sphere showing the relative positions of stars, etc

celestial horizon see horizon

celestial latitude see latitude

celestial longitude see longitude

celestial mechanics singular noun (astronomy)

The study of the motions of celestial objects in gravitational fields, esp, as by Newton, satellite and planetary motion in the solar system

celestial navigation noun

Navigation by the stars, etc (also astronavigation)

celestial poles plural noun (astronomy)

The two points at which the earth's axis, extended indefinitely, cuts the celestial sphere

celestial sphere noun (astronomy)

An imaginary sphere of infinite radius, of which the observer is the centre, onto which stars and other celestial bodies are projected