The Sun crosses the Celestial Equator this week, but what exactly does that mean?

However, twice a year—during the spring (vernal) and autumn (autumnal) equinoxes—the Earth’s axis is tilted neither toward nor away from the sun. Instead, the Earth sits "sideways" relative to the sun ...

Over the last several years or so you may have heard your local TV weather person declare March 1 as the start of meteorological spring. Personally, I think that term is a big misnomer. Some of ...

The equatorial coordinate system projects Earth's latitude and longitude onto the celestial sphere, using declination (angular distance from the celestial equator, measured in degrees) and right ...

Halfway between the celestial poles is the celestial equator, a projection of Earth’s equator onto the sky. The stars on the celestial equator rise due east and set due west. Delta Orionis, the ...