Hi,

Modified julian days, sensibly start at midnight.  There are a number of different
constants that one subtracts from JD to get MJD, though the common one is 2400000.5

cheers

bruce

On Mon, Sep 27, 2004 at 02:15:42PM +0200, Brent Pinkney wrote:
> >Remeber that julian days start at noon (hey, it makes sense if you are a
> >European astronomer) so JD 2451179.5 is midnight.
> 
> I cannot find the ref, but it is also ok for JDN to start at midnight -  
> this is what Squeak does.
> 
> There are lots of different JDN standrds, but you are correct, the  
> original artonomical definition was from noon.
> 
> 
> Brent
> 

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