Astronomical distance



the distance from one celestial body to another, measured in astronomical units, light-years, or parsecs.

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    a frame of reference in which the sun or center of mass of the universe is fixed and which does not rotate with respect to the fixed stars.

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  • Astronomical telescope

    a telescope having an objective with a long focal length and an eyepiece with a short focal length, usually used for observing celestial bodies. Historical Examples Kepler, in 1611, made the first astronomical telescope with two concave glasses. Astronomical Myths John F. Blake One word about the inversion of objects by the astronomical telescope. Half-hours […]

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    the spherical triangle formed by the great circles connecting a celestial object, the zenith, and the celestial pole.



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