(from https://www.timeanddate.com/astronomy/equinox-not-equal.html)
". . . "Equinox" literally means "equal night", giving the impression that the night and day on the equinox are exactly the same length; 12 hours each. But this isn't entirely accurate. . . Even if the name suggests it and it is widely accepted, it is not entirely true that day and night are exactly equal on the equinox – only nearly. . . Earth spins around its own axis approximately every 24 hours (a sidereal day is 23 hours, 56 minutes, 4 seconds). . . The time it takes Earth to orbit once around the Sun is around 365 days, 5 hours, 48 minutes and 45 seconds (365.242189 days). And, like two spinning tops connected at the tips, it also wobbles around on its axis, making a complete rotation every 26,000 years (axial precession). . . Earth is actually tilted at an angle of around 23.4 degrees toward the celestial pole, which is a certain point in the sky. As Earth makes its yearly orbit, 1 hemisphere faces the sun more than the other, the side that has summer. . ."
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