[fitsbits] Celsius unit in FITS keyword comments

[Forveille thierry]

  On 03/03/2016 03:31 PM, Lucio Chiappetti wrote:
> It is perhaps a pity that FITS standard 4.3.1 and Table 6 defining 
> compound units do NOT allow to define a compound unit as an unit 
> plus/minus a constant, so one cannot use K–273.15.
Well, it is a pity that the FITS compound units rules allow 
prefixed-units (I was outvoted on
that one, and still think that was a bad decision), and I am glad they 
at least do not allow
K–273.15, with the next step of course being (K–273.15)*9/5+32 ;-)