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First, the Earth's tilt DOES NOT change; the Earth spins like a gyroscope, and is remarkably stable. However, the Earth's axis, fixed as it is, is not perpendicular to the plane of the Earth's orbit. As the Earth orbits the Sun with its unchanging "tilt", the Sun "appears to" move north of the equator in late March, and move south of the equator in late September.

So starting on March 21, the Earth's axis is tilted (just a bit) toward the Sun, giving us longer and longer days until June 21. At the equator, it doesn't really make any difference, but for higher latitudes, the day length can become quite long.

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