Difference between revisions of "Galactic System of Coordinates"
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Revision as of 09:33, 9 April 2007
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Galactic System of Coordinates
</dt>
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>
]]
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
