It’s the time of the equinox or more specifically the spring equinox for us in the southern hemisphere. The equinox is a midpoint. It’s around now that day and night become equal in length (but more ...

How much of the sky can you see at any one time? This, of course, assumes you are looking up from a wide-open, flat field or out on an ocean liner with nothing but a flat horizon no matter which way ...

Since antiquity, the sky has been thought of as a bowl, or celestial sphere, that's directly overhead. The equatorial coordinate system that astronomers use to find stars and other objects is based on ...