[fitsbits] Celsius unit in FITS keyword comments

[Forveille thierry]

  On 03/07/2016 11:26 AM, Norman Gray wrote:
>
> And for what it's worth, I agree, too, from the point of view of the 
> IVOA VOUnits spec.
>
> That spec went to some pains to avoid being prescriptive about what 
> units may appear, limiting itself to being prescriptive only about the 
> parsing of unit strings -- that is, lists of ASCII characters -- that 
> do appear.  That prescription does have some implications for the 
> choice of units, but it's expressed as far as possible in terms of 
> 'known units' rather than 'permitted units', 'must be interpreted 
> consistently with' rather than 'must be interpreted as', and 
> 'preferred units' where there is a choice.
>
> If the extent of this non-committal position isn't clear from the 
> spec, that would I think warrant a revision of the text.
>
I am not sure that the IVOA spec should be considered directly relevant 
in a FITS context. It
does provide background on what neighbors decided on the issue, but 
certainly does not
define the rules that apply to FITS files.