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 ...

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 ...

The 2026 spring equinox is nearly here and will bring more daylight and warmer temperatures to parts of California.

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 ...

The autumn equinox is now upon us! Today marks the moment that the sun crosses the celestial equator, ushering in the beginning of astronomical autumn in the northern hemisphere, which brings with it ...

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 ...