-----Original Message-----
From: jack.lewis@xxxxxxxxxxxx
Sent: Sun, 11 Nov 2007 09:32:13 -0000Dear Neville,I have a question regarding the rotation time.The World takes 23h 56m 4.091s to rotate once about its axis. From where do we get a measurement of time that is not related exactly to the time of the Earth's rotation? Whys is there a 4 min. difference. This has always been a puzzle to me.Jack