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Re: Julian Day Numbers [message #22564 is a reply to message #22430]

Tue, 14 November 2000 00:00

Vapuser
Messages: 63
Registered: November 1998

Member

Ben Tupper <pemaquidriver@tidewater.net> writes:

<snip>

> P.S.
> The IDL JULDAY code cites the following reference, but I don't
> have it handy to check into. ; Translated from "Numerical Recipies
> in C", by William H. Press, ; Brian P. Flannery, Saul A. Teukolsky,
> and William T. Vetterling. ; Cambridge University Press, 1988
> (second printing).
>

Well, I just coded the julday subroutine given in _Numerical
Recipes_ and ran it for 1999/01/01 and it comes out as 2415021. I
also coded and ran the one line version given in _Spacecraft
Attitude and Control_ and it comes out the same as the _Numerical...

I also checked December 25, 1981, which _Spacecraft ... says should
be 2444964, all three routines give the same (correct) answer.

_Numerical... says May 23, 1968 is Julian Day 2440000, which checks
out for all three routines.

Might your reference be off?

whd
--
William Daffer: 818-354-0161: William.Daffer@jpl.nasa.gov

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[Message index]

		Julian Day Numbers By: Ben Tupper on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: Vapuser on Wed, 15 November 2000 00:00
		Re: Julian Day Numbers By: James Kuyper on Wed, 15 November 2000 00:00
		Re: Julian Day Numbers By: LC's No-Spam Newsread on Wed, 15 November 2000 00:00
		Re: Julian Day Numbers By: thompson on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: Craig Markwardt on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: Vapuser on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: Craig Markwardt on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: davidf on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: Ben Tupper on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: John-David T. Smith on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: Craig Markwardt on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: davidf on Tue, 14 November 2000 00:00

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