Read section 8.2 in your lab manual and answer questions 1-3.
Figure 8.1 The Galactic Coordinate System
Below is an artistically-rendered cross-section view of the Milky Way galaxy showing the Galactic latitude system centered on the Sun & Earth, with 4 objects at various latitudes labeled 1-4. Note that a latitude of 0° corresponds to the disk of our galaxy.
Below is an artistically-rendered top view of the Milky Way galaxy showing the Galactic longitude system centered on the Earth & Sun, with the x-ray bright objects Sco X-1 and the Crab Nebula Pulsar labeled by name. Note that a longitude of 0° corresponds to the center of our galaxy.
Below is a simulated image of the Milky Way galaxy showing the galactic longitude and latitude of a star.