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RE: New FITS Header
If we are not correcting for daylight saving time, that may account for it.
In Microsoft's documentation for gmtime(), used down inside the CFIT date
handling, it says
"Note The target environment should try to determine
whether daylight savings time is in effect. The C
run-time library assumes the United States’s rules for
implementing the calculation of Daylight Saving Time (DST)."
I don't recall if this is ANSI, and/or common across other compilers, but
Billy-boy didn't put a "Microsoft Specific" tag around it.
Another possibility is that gmtime(), localtime(), ... all use a single,
common, fixed buffer to do their dirty-work. If CFITS uses any of them
elsewhere, and we haven't copied the date/time string out for preservation,
it's going to get stomped on.
By the way, cfit2037.zip is available under the CFITS homepage at HEASARC.
Go to the download page, and select the 'unsupported historic versions' link
(I don't recall the exact wording, but that's close). That takes you to a
page with 2 or three old versions, and yet another link to 'more historic
versions' or something like that. CFIT2037.zip is on THIS page! as well as
buckets of other history.
Rich Klappal, CSQE
Lucent Technologies - Bell Labs
Convergent Systems Group.
: -----Original Message-----
: From: owner-tass@listserv.wwa.com [mailto:owner-tass@listserv.wwa.com]On
: Behalf Of Creager, Robert S
: Sent: Thursday, April 12, 2001 12:33 PM
: To: 'Tom Droege'; Shawn (Rolling Hills Obs); tass@listserv.wwa.com
: Subject: RE: New FITS Header
:
:
:
: I am using the fits routine 'fits_write_date( )'...
:
: Robert Creager
: Senior Software Engineer
: Client Server Library
: 303.673.2365 V
: 303.661.5379 F
: 888.912.4458 P
: StorageTek
: INFORMATION made POWERFUL
:
:
:
: > -----Original Message-----
: > From: Tom Droege [mailto:tdroege@veriomail.com]
: > Sent: Monday, April 09, 2001 8:29 PM
: > To: Shawn (Rolling Hills Obs); Creager, Robert S;
: > tass@listserv.wwa.com
: > Subject: Re: New FITS Header
: >
: >
: > Rob,
: >
: > Thanks Shawn, this is exactly what I am looking for, problems
: > in the format.
: >
: > Looks like Shawn has discovered a problem in DATE and
: > DATE-OBS. I get
: > DATE-OBS time part directly from TIME$. I don't see how I
: > could miss an
: > hour. What do you do?
: >
: > Tom Droege
: >
: > At 08:55 PM 4/9/01 -0400, you wrote:
: > >Ok, how about the DATE vs DATE-OBS keywords? Was the FITS
: > file really
: > >created an hour before the exposure? Maybe this would speed up the
: > >downloads - create all the files you think you might need
: > for the night ;)
: > >
: > >Shawn
: > >
: > >
: > >----- Original Message -----
: > >From: "Tom Droege" <tdroege@veriomail.com>
: > >To: "Tom Droege" <tdroege@veriomail.com>; <tass@listserv.wwa.com>
: > >Sent: Monday, April 09, 2001 6:59 PM
: > >Subject: Re: New FITS Header
: > >
: > >
: > > > OK, I have found one error, let's see if anyone else can
: > find it or
: > >others.
: > > >
: > > > Tom Droege
: > > >
: > > > At 05:43 PM 4/9/01 -0500, you wrote:
: > > > >Fits Fans, here is the latest version of the fits header
: > that I am
: > >writing
: > > > >on the data I take tonight. Please, fits experts, read
: > this carefully.
: > >I
: > > > >want to get to the point where I can take "keeper" data
: > with TOM. It
: > >will
: > > > >not be worth processing (I suspect) if the header is not
: > in near final
: > >form.
: > > > >
: > > > >Tom Droege
: > > > >
: > > > >SIMPLE = T / file does conform to
: > FITS standard
: > > > >BITPIX = 16 / number of bits per data pixel
: > > > >NAXIS = 2 / number of data axes
: > > > >NAXIS1 = 2043 / length of data axis 1
: > > > >NAXIS2 = 2037 / length of data axis 2
: > > > >EXTEND = T / FITS dataset may
: > contain extensions
: > > > >COMMENT FITS (Flexible Image Transport System) format
: > defined in
: > > > >Astronomy and
: > > > >COMMENT Astrophysics Supplement Series v44/p363,
: > v44/p371, v73/p359,
: > > > >v73/p365.
: > > > >COMMENT Contact the NASA Science Office of Standards
: > and Technology for
: > >the
: > > > >COMMENT FITS Definition document #100 and other FITS
: > information.
: > > > >DATE = '2001-04-09T21:21:23' / file creation date
: > (YYYY-MM-DDThh:mm:ss
: > >UTC)
: > > > >FILTER = 'V '
: > > > >LATITUDE= 41.8271 / Site H latitude, degrees north
: > > > >LONGITUD= -88.3125 / Site H longitude, degrees east
: > > > >RALIM = -9.5 / RA Limit Switch
: > Position Degrees East
: > > > >DECLIM = 0. / Declination limit
: > switch Degrees North
: > > > >DATASEC = '[ 17:2064, 1:2048]' / Place keeper for Active
: > area of the
: > >detector
: > > > >BIASSEC = '[ 10: 15, 1:2048]' / Place keeper for
: > Under-Over scan region
: > > > >TIMESYS = 'UT ' / time system for exposure start
: > > > >EPOCH = 2001. / Place keeper for Epoch
: > of coordinates
: > > > >EQUINOX = 2000. / Place keeper for
: > Equinox of coordinates
: > > > >SCALE = 7.4 / Arc seconds per pixel
: > > > >TIMEBASE= 'Manual GPS' / By hand transfer to PC clock
: > > > >COMMENT Additions to Constant File
: > > > >RA = '4:31:8.97' / RA of Field Center
: > > > >CRVAL1 = 4.52471659378365 / RA of Field Center
: > > > >RATIME = '1.976563' / Seconds since turning
: > on RA drive
: > > > >IMAGETYP= 'object ' / object frame
: > > > >WATERTMP= '26.92675' / Cooling water temperature
: > > > >VCOTEMP = '32.45043' / VCO Temperature
: > > > >DEC = '0:00:00 ' / Place Keeper for DEC of
: > field center
: > > > >CRVAL2 = '0 ' / Place Keeper for DEC of
: > field center
: > > > >UT = '22:21:18' / Universal time of #0
: > exposure (V) start
: > > > >COMMENT This is the #0 Camera File
: > > > >DATE-OBS= '2001-04-09T22:21:18' / UT date-time of exposure start
: > > > >UTSTART = '22:21:18' / Universal time of #0
: > exposure (V) start
: > > > >EXPTIME = 99.85938 / Open Time for Camera 0 usually V
: > > > >GAIN = 2.5 / Place Keeper for Gain
: > in electrons per
: > >adu
: > > > >RDNOISE = 25. / Place Keeper for Read
: > Noise in electrons
: > > > >CDTEMP = '4.77099 ' / CCD Temperature Camera 0
: > > > >END
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