Galactic System of Coordinates

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Galactic System of Coordinates

An astronomical coordinate system using latitude measured north and south from the galactic equator and longitude measured in the sense of increasing right ascension from 0 to 360 degrees. See coordinate, table. </dd>
Galactic latitude is designated b, galactic longitude l. The reference points for galactic coordinates were changed by action of the International Astronomical Union in 1958. The new values are: the north galactic pole lies in the direction right ascension = 12 hours 49 minutes, declination = 27.4 degrees N (equinox 1950); the new zero of longitude is the great semicircle originating at the new north galactic pole at the position angle 0 = 123 degrees with respect to the equatorial pole for 1950. [[/a>|/a> ]]


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use