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Re: Keep checking your GPS
From: Don Seltzer
Date: 2015 Feb 9, 14:41 -0500

On Mon, Feb 9, 2015 at 1:31 PM, Bill B  wrote:

>In accord with astronomical tradition, astronomers had always used Greenwich Mean
> Astronomical Time (GMAT)--the same as GMT but with the day beginning at noon.

To further complicate the issue, the Naval day also began at noon, but
24 hours before the corresponding astronomical day.  That is, the
naval day began 12 hours before the midnight start of the civil day,
but the astronomical day began 12 hours after the start of the civil
day.

Don Seltzer

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