Supergalactic coordinate system

dcterms modified equal to or less than 2020-11-19T16:27:39.780Zequal to or more than 2020-11-19T16:27:39.780Z
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definition A spherical coordinate system in which the equator is the supergalactic plane. Supergalactic longitude, SGL, is measured counterclockwise from direction l = 137.37 deg, b = 0 deg (between 0 and 360 deg). The zero point for supergalactic longitude is defined by the intersection of this plane with the Galactic plane. In the equatorial coordinate system (J2000) this is approximately 2.82 h, +59.5 deg. Supergalactic latitude, SGB, is measured from the supergalactic plane, positive northward and negative southward. The North Supergalactic Pole (SGB=90 deg) lies at galactic coordinates l = 47.37 deg, b = +6.32 degrees, corresponding to the equatorial coordinate system (J2000) 18.9 h, +15.7 deg.
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