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The "sub-solar point" is the point on Earth where the Sun is straight up, at a 90 degree angle to the ground. This point moves around the Earth each day as the Earth rotates, and appears to move north and south over the course of the year.

The sub-solar point is exactly on the equator at the moment of the two equinoxes.

In March, the sub-solar point is moving north as it crosses the equator; in September, the sub-solar point is moving south across the equator. In June, the sub-solar point creeps up to the Tropic of Cancer and then heads south again. In December, the sub-solar point gets all the way south to the Tropic of Capricorn at the winter solstice.

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16y ago

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