Analogous to terrestrial longitude, galactic longitude is usually measured in degrees ( ?).
2.
It is located at-0.40?-0.22?galactic longitude and latitude.
3.
Generally the data is analyzed as FITS-format " cubes " of Galactic longitude, latitude, and velocity.
4.
Consider a star in the midplane of the Galactic disk with Galactic longitude l at a distance d from the Sun.
5.
As described below, one can measure A and B from plotting these velocities, measured for many stars, against the galactic longitudes of these stars.
6.
:The Sun is currently moving towards Hercules therefore the direction of rotation is towards the nearer 90?galactic longitude 0?lat, not the 0? 270?
7.
But, if we plot transverse velocity divided by distance against galactic longitude for a large sample of stars, we know from the equations above that they will follow a sine function.
8.
Thus, the Oort constants can be expressed in terms of the radial and transverse velocities, distances, and galactic longitudes of objects in our Galaxy-all of which are, in principle, observable quantities.
9.
With a galactic latitude of 4 degrees and galactic longitude 71 degrees, this system lies inward along the same Orion Spur in which the Sun is located within the Milky Way, near where the spur approaches the Sagittarius Arm.
10.
In 1958 the International Astronomical Union ( IAU ) defined the galactic coordinate system in reference to radio observations of galactic neutral hydrogen through the hydrogen line, changing the definition of the Galactic longitude by 32?and the latitude by 1.5?
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