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'''Galactic System of Coordinates'''
 
</dt><BR/>An astronomical [[Coordinate System|coordinate 
system]] using latitude measured north and south from the galactic equator 
and longitude measured in the sense of increasing [[Right Ascension|right 
ascension]] from 0 to 360 degrees. See [[Coordinate|coordinate]], 
table. 
</dd><BR/>''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>
]]
==References==
''This article is based on NASA's [[NASA SP-7|Dictionary of Technical Terms for Aerospace Use]]''
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