Transcript: Astronomers use a special set of coordinates to define the position of objects within the Milky Way galaxy. The galactic equator runs along the center of the Milky Way band. Galactic longitude, abbreviated by the small letter L, is the angular distance along the Milky Way with zero at the galactic center in the Sagittarius region. L equals ninety degrees is in the constellation of Cygnus near the top of the Northern Cross. L equals a hundred and eighty degrees, opposite to the galactic center, also called the anti-center direction, is in the constellation Taurus near the Pleiades and Hyades clusters, and L equals two hundred and seventy is south of Canis Major. Galactic latitude, denoted by the small letter B, is defined to be zero on the galactic equator. The direction B equals plus ninety is straight up out of the disk in the northern sky, and B equals minus ninety degrees is the opposite direction, straight out of the disk in the southern sky.