[fitsbits] WCS Paper III MJD-AVG vs. DATE-AVG

[Steve Allen]

On Fri 2004-10-22T11:42:59 -0700, Steve Allen hath writ:
> The tricky part here is that this begins to tread on the grounds of a
> supposed subsequent WCS paper (WCS Paper V?)  which seems likely to
> have a title something like "Representations of temporal coordinates
> in FITS".

The other tricky part is what would DATE-AVG look like in
table 13 of WCS Paper III.

MJD-AVG   becomes       MJDAna

DATE-AVG  would be      ?

	DATAna          is mnemonically confusing

	DTAVna          to be read "date/time average" is better
			but loses contact with the "DATExxxx" tradition
			already in the standard.

Note that the "n" corresponds to column number and the "a" is there
for the sake of the supposed WCS Paper V so as to permit different
time scales (or even different relativistic reference frames) to be
used for different versions of the WCS.

--
Steve Allen          UCO/Lick Observatory       Santa Cruz, CA 95064
sla at ucolick.org      Voice: +1 831 459 3046     http://www.ucolick.org/~sla
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