Supergalactic coordinate system

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The supergalactic coordinate system - the astronomical coordinate system in which the basic circle (the equator) lies in the supergalactic plane (SGP), where nearby galaxy clusters (Panther, Great Attractor or Perseus-Pisces Supercluster). The supergalactic plane was introduced by Gérard de Vaucouleurs in 1953, although such a specific distribution of "nebulae" was already spotted by William Herschel more than two centuries earlier. Also de Vaucouleurs was the first to formally define supergalactic coordinates.

Starting point u.w.s. is one of the two intersections of the SGP with the plane of the Galaxy. The position of the object is determined by the supergalactic width SGB and the supergalactic length SGL. North pole u.ws. (SGB = 90 °) is in the direction determined by the galactic coordinates l = 47.37 °; b = + 6.32 °, starting point u.w.s., SGL = 0 °; SGB ​​= 0 °, located at l = 137.37 °; b = 0 DEG.

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