The 2023 spring equinox is on its way — here's what it is and how it works
Earth's rotation does not cause equinoxes. The spring equinox occurs when the sun's warming rays line up perpendicular to Earth's axial tilt:If you stand directly on the equator at noon in the Eastern Time time zone at noon, the sun will appear more or less directly overhead. Your shadow will also be at its absolute minimum.But this moment won't last as the Earth makes its way around the sun at a speed of roughly 66,600 mph.
This creates a great opportunity to photograph the planet over the course of the year and see how the the angle of sun changes.below using geosynchronous satellite images taken over Africa, and it clearly shows the seasonal progression:March 20 is officially the first day of spring, but meteorologists take a very different view of our seasons. For them, spring started on March 1.
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