A system in which a celestial object's position on the celestial
sphere is described in relation to the structure of the Milky Way galaxy. An object's galactic longitude is measured
along the galactic equator, a great circle on the celestial sphere that follows the band of the Milky Way.
The galactic equator, also called the galactic circle, is inclined at an angle of approximately 62° to the
celestial equator; distances are measured along it beginning at a point in the constellation Sagittarius lying in
the direction of the Milky Way's nucleus. The galactic poles are the two points where a perpendicular line through
the middle of the plane of the galactic equator intersect the celestial sphere. An object's galactic latitude is
measured in degrees north or south of the galactic equator toward the galactic poles.
source : galactic coordinate system. Dictionary.com. The American Heritage® Science Dictionary.
Houghton Mifflin Company. http://www.dictionary.com/browse/galactic-coordinate-system (accessed: March 5, 2017).
GalacticCrs is initialized with the following parameters :
- geoideName = Galactic
- radius = 10.0
- realPlanetRadius = 1.0
- type = Sky
- geoBound = new GeoBound(0, -90, 360, 90)
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