autumnal equinox

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seasonal configuration of Earth and Sun

What causes the seasons?

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Colorful winter sunset

What's the Difference Between a Solstice and an Equinox?

Encyclopaedia Britannica First Edition: Volume 1, Plate XLIII, Figure 1, Astronomy, Solar System, Equation of Time, Precession of Equinoxes, Earth, orbit, ecliptic, apogee, perigee, line of apsides, mean anomaly, tropical year, Sydereal, Julian

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autumnal equinox: Media

astronomy

Videos

What causes the seasons?

What causes the seasons?

In many parts of the world, weather cycles through the four seasons like clockwork:...

Video: Encyclopædia Britannica, Inc.

Images

seasonal configuration of Earth and Sun

seasonal configuration of Earth and Sun

Earth's orbit around the Sun, with the positions of solstices and equinoxes.

Encyclopædia Britannica, Inc.

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