> 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