The cause of an equinox
In layman's terms, the equinox happens because the planet earth is not tilted towards the sun while the sun is directly above the equator. This causes the equinox to happen.
So during this time of the year, both hemispheres get the same hours of daylight and night.
On a usual basis, the earth is tilted as it orbits around the sun, about 23.5 degrees. This tilt causes the difference in how much of the sun's radiation we receive at various times of the year.
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