Radian/Steradian
MilesCranmer opened this issue · 4 comments
Radians and steradians are dimensionless, but really should be treated like units. So far they have been excluded from the library (along with their derived units, like lumens and lux), but it could be useful to include them somehow. Maybe once #24 merges, there could be an alternate RadQuantity, RadDimensions objects for propagating these units, with promotion properties from regular Quantity objects so the units submodule can be used as normal.
Just to shamelessly advocate for my own interests, I would really love to be able to represent degrees, radians, and steradians in DynamicQuantities. As a EE, I use a lot of compound radiometric units and work in rotational systems.
Note the “Custom Dimensions” example here: https://symbolicml.org/DynamicQuantities.jl/dev/examples/#Custom-Dimensions
I’m not sure how to implement it more generally since radian is kind of a “fake” unit and formula written with it don’t necessarily cancel out correctly. Like for the formula length = radius * angle, you obviously wouldn’t have radius in terms of meters divided by a radian... basically wherever you pass an angle you would have to divide out a radian...
Proposal in #117