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Yesterday in 1582 marks the change from the Julian to the Gregorian calendar. Check this out:
On Oct. 5, 1582, much of the world replaced the Julian calendar with the Gregorian calendar; the switch required the 10 days after Oct. 4 to be erased from history.
So they had to leap-frog over all those days to make it work. I don't think the Gregorian calendar is airtight, but I think it's pretty accurate. I recall a few years ago when world time had to jump forward by a second....I think that was due to a discrepancy between the earth's movement and the Renaissance calendar.
They actually add a second every couple of years. I think it is the observatory in Oxford that does it. All because the earth doesn't quite orbit the sun correctly. I think I remember hearing that it had something to with precession, the earth is actually slowing down in its orbit.
