galactic coordinate system

galactic coordinate system, astronomical coordinate systemin which the principal axis is the galactic equator (the intersection of the plane of the Milky Way with the天球) and the reference points are the north galactic pole and the zero point on the galactic equator; the coordinates of a celestial body are its galactic longitude and galactic latitude. In the IAU galactic coordinate system, introduced in 1958 by the International Astronomical Union, the zero point on the galactic equator has the equatorial coordinates R.A. 17^h39.3^mand Dec. −28°55′; this lies in the direction of the center of our galaxy, the Milky Way.

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