Re: Date and time on Cindu: yearly update

Yes, but to an astronomer, "Julian Date" only ever means one thing, and as
you say, the usual practice is simply to write "JD", the interpretation
always being clear from the context. In my field (variable stars) you use
nothing else. And in fact, GMAT itself is now falling out of favour, being
replaced by UT (Universal Time, which starts at midnight).
Mike
----- Original Message -----
From: "Mark J. Reed" <markjreed@...>
To: <CONLANG@...>
Sent: Monday, May 19, 2008 3:41 AM
Subject: Re: Date and time on Cindu: yearly update



> Gah.  Unfortunately, "Julian Date" is an overloaded term which can
> also mean simply the date in the Julian calendar and is also often
> used (incorrectly) to mean the day number within the current year.  So
> while astronomers distinguish between "Julian Day" (integral value)
> and "Julian Date" (value with fraction indicating time of day), I just
> lump them both togther as "Julian Day" or, better yet, the unexpanded
> acronym "JD", to avoid confusion.  Another possibility I've seen used,
> along the GMAT lines, is "Julian Astronomical Day/Date" or "JAD".
>
>
> --
> Mark J. Reed <markjreed@...>
>
>
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