Why are temperatures more moderate around the fall and spring equinoxes?

At the equinoxes, Earth’s axis is tilted neither toward nor away from the Sun. Sunlight is therefore distributed more evenly between the Northern and Southern Hemispheres than it is at the solstices, when one hemisphere tilts toward the Sun. This helps make temperatures more moderate around spring and fall. The axis’s tilt itself does not change during the year.

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