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Celestial sphere definition, the imaginary spherical shell formed by the sky, usually represented as an infinite sphere, the center of which is a given observer's position. See more.
This is a compilation of initialisms and acronyms commonly used in astronomy. Most are drawn from professional astronomy, and are used quite frequently in scientific publications. A few are frequently used by the general public or by amateur astronomers. Celestial object â acronyms for natural objects in space and for adjectives applied to objects in space. 2  Instrumentation â telescope and other spacecraft equipment, particularly detectors such as imagers and spectrometers. 3  Meeting â meetings that are not named after organizations.