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Re: TIME2JD [message #92694 is a reply to message #92693]

Mon, 08 February 2016 21:31

Jim Pendleton
Messages: 165
Registered: November 2011

Senior Member

On Monday, February 8, 2016 at 10:19:56 PM UTC-7, Sapna Mishra wrote:
> Yeah Mike,
> I am actually interested in the fractional part. I am dealing with fits file of the same date having different UT, actually I want to extract UT of each file and calculate JD, which I was expecting to be different for each files(talking about fractional part). But all the routines in IDL (including julday.pro) are giving me JD upto one decimal place which is almost similar for each file.
> Can any one suggest me any routine which can provide me JD upto high precision (like upto 4-5 decimal place)
> Also I want to ask can anyone tell how to deal with float variables in unix shell scripts???

Are you confusing the printed output format with the actual precision of the data? The JULDAY() function returns a double-precision number. If you're simply looking at the output from PRINT, that's only going to display 8 digits. But if you use a better FORMAT statement with PRINT, or you use implied print, you'll see many more digits.

IDL> print, julday()
2457427.4
IDL> help, julday()
<Expression> DOUBLE = 2457427.4
IDL> julday()
2457427.4363425933
And a little later in elapsed time...
IDL> print, julday(), format = '(d)'
2457427.4374884265000000

Jim P.

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[Message index]

		TIME2JD By: Sapna Mishra on Mon, 08 February 2016 02:03
		Re: TIME2JD By: greg.addr on Mon, 08 February 2016 02:44
		Re: TIME2JD By: Sapna Mishra on Mon, 08 February 2016 03:00
		Re: TIME2JD By: greg.addr on Mon, 08 February 2016 03:46
		Re: TIME2JD By: Michael Galloy on Mon, 08 February 2016 09:41
		Re: TIME2JD By: Sapna Mishra on Mon, 08 February 2016 21:19
		Re: TIME2JD By: Jim Pendleton on Mon, 08 February 2016 21:31
		Re: TIME2JD By: Sapna Mishra on Tue, 09 February 2016 02:26

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