Deep Time: The Tyranny of Time
To The Best Of Our Knowledge
00:00
The Leap Second
By convention, there are two days in any year when a leap second can be inserted. There is a giant industry of earth rotation time measurement all around the world. The mirrors that were placed on the moon by Apollo astronauts still have lasers fired at them from earth. And then the beam comes back and gives us a very, very careful measurement of earth's position in space.
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