Regarding the right ascensions and declinations of celestial objects for the purposes of amateur astronomy, some coordinates ...

The east-west coordinate is a little bit trickier. Imagine an orange having 24 equal slices. Next imagine that the orange expands until its completely fills the celestial sphere. Orient the orange ...

Both are spherical surfaces. As on the globe, points on the celestial sphere can be represented using a coordinate system similar to latitude and longitude, but more about that later. First we ...

Earth is roughly a sphere and spins on its axis ... Mirroring the terrestrial coordinate system, we define the north celestial pole as 90 degrees, the south celestial pole as –90 degrees ...

By imagining Earth at the center of a celestial sphere, he used a coordinate system similar to latitude and longitude, which had recently been devised, to measure the precise positions of the stars.

The first step is to assume a position, a set of coordinates I determine by deduced ... of Sirius on the celestial sphere for that time at that date. With more formulas and tables (there are ...