[fitsbits] Question on angstrom and erg units in FITS standard

[Thomas Robitaille]

Thanks to everyone for your answers and exegeses - much appreciated!

Cheers,
Tom





On 5 November 2014 10:34, Lucio Chiappetti <lucio at lambrate.inaf.it> wrote:
> On Tue, 4 Nov 2014, Arnold Rots wrote:
>
>> I think the authors waffled on the issue, on purpose.
>
>
> Can't remember whether it was done on purpose in FITS 3.0 or simply
> inherited from the previous versions.
>
>> There are three statements that are relevant here:
>
>
>> 1. FITS writers *should* use the IAU recommended SI units
>> 2. Angstrom and erg are *deprecated in the IAU list*
>> 3. Angstrom and erg are in a list of *allowable units*
>
>
>> My interpretation is that Angstrom and erg are not deprecated in FITS, but
>> neither are they on the preferred list of units: the combination of the
>> three statements says that they are allowable, but you *should* not use them
>> (i.e., less strong than deprecated),
>
>
> Given that there is no such thing as an "authenticated interpretation"
> my interpretation agrees with Arnold's
>
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