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 ...

The comet is almost at its closest approach to Earth on July 14. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A megacomet glows in the dark in ...

Each Monday, I pick out North America’s celestial highlights for the week ahead (which also apply to mid-northern latitudes in the Northern Hemisphere).

DULUTH — We woke up to winter, and now it's spring. Funny how astronomical events can turn on a dime. The new season began at 10:33 a.m. CDT Sunday when the center of the sun crossed the celestial ...

The summer's been so hot it's hard to imagine that fall has arrived. But celestial bodies don't look at thermometers. They move on. And that's why we're headed for frosty mornings, like it or not. For ...

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 ...

Dutch celestial cartographer Wil Tirion, who created two landmark star atlases used worldwide by amateur astronomers, died July 5. He was 81 years old. Tirion’s most popular work, Sky Atlas 2000.0, ...