And it's not because of leap seconds; it's a fundamental property of most days.
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Although it takes Earth 23 hours and 56 minutes and 4.09 seconds to spin 360 degrees on its axis, the Earth is also in motion with respect to the Sun. If we demand that the Sun reach the same point in the sky from one day to the next, we need to account for the Earth's motion as well.A day isn't the time it takes Earth to rotate 360°, which leaves us 3 minutes and 55.91 seconds short.
Over the course of a 365-day year, the Sun appears to move not only up-and-down in the sky, as determined by our axial tilt, but ahead-and-behind, as determined by our elliptical orbit around the Sun. When both effects are combined, the pinched figure-8 that results is known as an analemma. The Sun images shown here are a selected 52 photographs from César Cantú's observations in Mexico over the course of a calendar year.That extra rotation takes 235.
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