Interesting Tip-Off Time - The Official Forum

#13 (permalink)

Fri Jul 24, 2009, 09:26am

Adam

Keeper of the HAMMER

Join Date: Jan 2003

Location: MST

Posts: 27,190

Quote:

Originally Posted by mbyron

1. Prior to the development of chronometers capable of measuring microseconds, the sidereal second was sufficiently precise.

2. It matches a sidereal second pretty closely. If you're asking why cesium 133, I don't know the answer to that one. Sorry!

2 is easy. cesium 132 wasn't quite long enough, and cesium 134 was too long.

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