The view we have of the sky constantly changes. It is like we are in a goldfish bowl, spinning around, in constant motion. Everything seems as though it is moving, because we are on a ball that is enormous. It is known as the celestial sphere.
This creates a celestial grid. Lines that join the grid are measured in time and are known as right ascentions while parallel are known as Declinations and are measured in degrees. The line directly above the equator is the celestial equator and is 0 degrees. Northern position are positive and southern are negative and the highest degree they both have are 90.
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