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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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