The Mechanics of Earth's Spin Earth rotates once in about 24 hours with respect to the Sun, but once every 23 hours, 56 ...

It's Dec. 1, but despite the incoming snow and ice, the official start to winter is still three weeks out. Here's when winter ...

Many people wonder why they can sometimes spot the moon in the middle of the day. The simple answer is that the moon is close ...

The winter solstice is quickly approaching. Here's what you need to know about the official start of winter in 2025.

Day and night will get equal time for a brief moment Monday as much of the world heads into fall. The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere ...

Spring has sprung! Kat Troche from NASA expains why the length of day and night on the equinox aren’t precisely equal: Depending on your locale, equinoxes can be seen as harbingers of longer nights ...

On Sept. 22, the autumnal equinox, which signals the start of fall in the Northern Hemisphere, finally brings an end to our long, hot summer on Monday at 2:19 p.m. EDT. This happens at a precise ...

Day and night will get equal time for a brief moment Monday as much of the world heads into fall. The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere ...