[fitsbits] DATE-OBS versus TIME-OBS

[Louis Giglio]

We use this:

DATE-OBS= '2001-08-31T23:48:52' / start of observation (UTC)
END-OBS = '2001-09-30T22:55:21' / end of observation (UTC)

END-OBS is of course a local convention.

Cheers,
Louis


On Tue, 22 Jan 2002, Steve Allen wrote:

> Date: Tue, 22 Jan 2002 14:32:12 -0800
> From: Steve Allen <sla at ucolick.org>
> To: FITSbits <fitsbits at NRAO.EDU>
> Subject: Re: [fitsbits] DATE-OBS versus TIME-OBS
> 
> On Tue 2002-01-22T21:54:32 +0000, William Thompson hath writ:
> > How are other groups handling this?
> 
> snips from the header of our soon-to-deliver instrument
> 
> DATE-OBS= '2002-01-04'
> UT      = '13:11:43.12'
> 
> DATE_BEG= '2002-01-04T13:11:43'
> DATE_END= '2002-01-04T13:11:44'
> 
> The explanation for this is that DATE-OBS and UT are traditional
> keywords which are generated by an existing system that provides date
> only and time only.  Our traditional usage of DATE-OBS provides no
> more precise a definition of its meaning than was in the original FITS
> paper.

{remainder deleted}


Louis Giglio
Science Systems and Applications, Inc.
NASA/GSFC Code 923
Greenbelt, MD 20771
(301) 614-6698
giglio at hades.gsfc.nasa.gov