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

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 ...

Celestial happening this week: This coming Friday evening, the first evening of spring, there’ll be a nice conjunction ...

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 ...