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Re: Problems with JULDAY and CALDAT [message #14828]

Wed, 07 April 1999 00:00

John J. Boia
Messages: 5
Registered: November 1997

Junior Member

Wayne, thanks for the references. Will have a look.

I checked JULDAY just like your example and got different results
from what you got!

IDL> print,julday(4,7,1999,0)
% Compiled module: JULDAY.
2451276.0
IDL> print,julday(4,7,1999,12)
2451276.5
IDL> print, !version
{ mipseb IRIX unix 5.0.2 Aug 19 1997}

Wayne Landsman wrote:
>
>> JULDAY seems to return Julian date values with an offset
>> of 0.5 from the accepted definition, when hours, minutes,
>> and seconds are passed in as arguments Integer julian
>> day numbers correspond to 12:00 noon UT.
>
> I'm not sure what you are referring to here -- I don't see any problems with
> JULDAY. JULDAY should return an integer value when the hour is 12:00 noon --
> which it does.
>
> IDL> print,julday(4,7,1999,0)
> 2451275.5
> IDL> print,julday(4,7,1999,12)
> 2451276.0
>
> --Wayne Landsman landsman@mpb.gsfc.nasa.gov

--
John J. Boia | Email: jboia@iasdev1.gsfc.nasa.gov
Programmer/Analyst | Web: http://iasdev1.gsfc.nasa.gov/~jboia/
Computer Sciences Corp. | Phone: 301.794.2357

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		Re: Problems with JULDAY and CALDAT By: John J. Boia on Wed, 07 April 1999 00:00
		Re: Problems with JULDAY and CALDAT By: landsman on Wed, 07 April 1999 00:00

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