The galactic longitude increases in the same direction as right ascension.

He knew the galactic poles, and he could recognize galactic longitude.

That's your galactic longitude.

It can be displayed in plots such as those of Fig. 4 of line-of-sight velocity against galactic longitude l.

Analogous to terrestrial longitude, galactic longitude is usually measured in degrees ( ).

As described below, one can measure and from plotting these velocities, measured for many stars, against the galactic longitudes of these stars.

The three numbers that compose its name indicate, respectively, the galactic longitude and latitude, and velocity towards Earth in km/s.

Consider a star in the midplane of the Galactic disk with Galactic longitude at a distance from the Sun.

Tanebor's location provided a baseline for their definitions of galactic longitude and orbital plane, enabling the conversion of the other systems' coordinates.

Galactic latitude resembles the elevation above the galactic plane and galactic longitude determines direction relative to the center of the galaxy.

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.

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.

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.

He'd take a look at the Trent listing in the Directory, copy out its coordinates and proper motion, check the galactic poles and zero galactic longitude by observation out the ports, and then get at the really tricky stuff when he learned the ship's destination.

("PK 164+31.1" basically represents the planetary nebula that when using the galactic coordinate system has a galactic longitude of 164 degrees, a galactic latitude of +31 degrees, and is the first such object in the Perek-Kohoutek catalog to occupy that particular one square degree area of sky).