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underpants

(187,777 posts)
1. Very interesting
Tue Dec 31, 2024, 11:26 AM
Dec 31

That harkens back to a longstanding maritime tradition of ports dropping a ball at a specific time every day, allowing ship captains to precisely adjust their navigational instruments. Famous examples include England's Royal Observatory, Greenwich and the U.S. Naval Observatory in Washington, D.C. — both of which still lower balls daily (at 1 p.m. and noon, respectively).

Time balls
https://en.wikipedia.org/wiki/Time_ball

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