[AstroPy] Units with time-dependent conversion

[JJ Kavelaars]

Perhaps currency is a coordinate transform rather than a unit change.

JJ

> On Aug 4, 2016, at 3:33 AM, Elke Schaper <elkewschaper at gmail.com> wrote:
> 
> Dear Astropy-Team,
> 
> 
> thanks for a great tool first of all!
> Perhaps this question has been asked before:
> 
> We would like to add “Currency” as a unit system to astropy, with units such as “USD”, “EUR”, … 
> This would allow to use all of the great astropy functionality (e.g. the close integration with numpy) on monetary data also, combined with all already integrated units.
> 
> In principle, new units are easy to add to Astropy.
> Now comes the challenge:
> 
> Conversions between these units change with time. For example, there are other great Python packages (such as https://pypi.python.org/pypi/CurrencyConverter/0.5 <https://pypi.python.org/pypi/CurrencyConverter/0.5>) to do a time dependent conversion. 
> 
> Is it possible to add “time” as an input parameter to unit conversion in Astropy?
> If yes, could you give me some hints how to best go ahead (I would probably need to overwrite some of the internal functionality?). Or is this a solved problem, just I overlooked it?
> 
> 
> 
> Thanks a lot, all the best!
> 
> 
> Elke
> 
> 
> 
> 
> 
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