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the branch of astronomy that deals with the application of the laws of dynamics and Newton’s law of gravitation to the motions of heavenly bodies.
the study of the motion of celestial bodies under the influence of gravitational fields
celestial mechanics
The science of the motion of celestial bodies under the influence of gravitational forces. See more at Kepler’s laws of planetary motion, relativity.


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  • Celestial meridian

    celestial meridian A great circle on the celestial sphere passing through the celestial poles and an observer’s zenith. An observer’s celestial meridian is not a fixed reference on the celestial sphere but rather changes with the observer’s location on Earth. Stars transit an observer’s celestial meridian (that is, cross directly overhead in the sky at […]

  • Celestial-navigation

    navigation by means of observations made of the apparent position of heavenly bodies. noun navigation by observation of the positions of the stars Also called astronavigation celestial navigation Navigation of a ship or aircraft based on the observed positions of celestial bodies. See more at altazimuth coordinate system.

  • Celestial-pole

    each of the two points in which the extended axis of the earth cuts the celestial sphere and about which the stars seem to revolve. noun either of the two points at which the earth’s axis, extended to infinity, would intersect the celestial sphere Sometimes shortened to pole celestial pole Either of the two points […]

  • Celestial-sphere

    the imaginary spherical shell formed by the sky, usually represented as an infinite sphere, the center of which is a given observer’s position. noun an imaginary sphere of infinitely large radius enclosing the universe so that all celestial bodies appear to be projected onto its surface celestial sphere An imaginary sphere with Earth at its […]

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