Earth's orbit around the Sun also plays a role in the changing of seasons. The orbit is not a perfect circle, but rather an elliptical shape.

The equinox is the moment when the tilt of Earth’s axis is such that the sun’s rays shine directly over the equator.

Equinoxes occur twice a year, with night and day being almost the exact same length all across the world. The next equinox is ...

The nights have been cool and crisp! September 1st marks the start of meteorological fall but what is the difference between meteorological and astronomical fall?

Earth’s orbit around the Sun isn’t a perfect circle—it’s slightly elliptical. Each year, around July 2 or 3, Earth reaches its farthest point from the Sun, known as aphelion.

When is the first day of fall? What time is the autumn equinox? When do we change the clocks? Your questions answered.

Earth is the planet we have the best opportunity to understand in detail—helping us see how other rocky planets behave, even ...

The meteorological seasons are defined as spring (March, April, May), summer (June, July, August), autumn (September, October ...

Meteorological fall begins on September 1, which is also Labor Day this year. Meteorological fall always begins on September 1 and goes through November 30 every year. Many think the start of fall is ...

Webb's orbit will keep the telescope in line with Earth as our planet orbits the sun. This alignment protects the telescope from the heat released by the sun, Earth and even the moon.

The rusty world is full of mysteries—and some of the solar system's most extreme geology. Learn more about Earth's smaller, ...