That’s only true if you are positioned at the very north or south pole, or from the equator. From the poles, however, all you ever see is the same half of the celestial sphere. From the equator ...

Now, imagine turning on a bright light at Earth’s center and projecting our planet’s equator onto the celestial sphere. Earth’s equator then becomes another circle — the “celestial ...

Earth is roughly a sphere and spins on its axis ... Halfway between the two poles is the celestial equator, marking the boundary between the northern and southern sky. Mirroring the terrestrial ...

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