[fitsbits] Celsius unit in FITS keyword comments

[Peter Weilbacher]

On Thu, 3 Mar 2016, 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.

How about
   ln(exp(K)/exp(273.15))
instead? (Not that I would suggest for anyone to actually use that.)

   Peter.