Today may be shortest day ever

On Wed, Jul 9, 2025 at 12:18 PM Larry wrote:

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> https://www.dailymail.co.uk/sciencetech/article-14885815/Shortest-day-history-TOMORROW-Earths-rotation.html

"Earth normally takes 24 hours, or exactly 86,400 seconds, to complete one full rotation, which is called a solar day."

A solar day is different from one complete rotation.  A solar day is the time that elapses from high noon to high noon.  But in a day, the Earth moves about 1 degree around the sun.  That means that high noon is about 1 degree different from one day to the next.

If we measure by the stars, a full rotation, called a sidereal day, takes 23 hours and 56 minutes.