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Julian Day Question [message #48887]

Thu, 25 May 2006 19:53

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Folks,

The last thing I, uh, would want to do is cause great
confusion, but I have a question about time.

My copy of Astronomical Algorithms arrived today, and I've
spent the evening out on the porch, drinking a beer,
reading it. There is a very interesting chapter on
how to calculate a Julian Day number for a date. Oddly,
neither the IDL JULDAY, or the JHUAPL Library YDM2JD routines
produce the answers given by Jean Meeus in the table on
page 62 of his book, which (he says) can be used to "test
your algorithms".

Moreover, the algorithms used in all three implementations
appear to be different from one another. Weird.

Anyone have any ideas about this? Is a Julian Day number
a "standard" in the sense that OpenGL is a standard?

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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