PhysicalConstants is a Julia package which has the values of a range of physical constants. Currently MKS and CGS units are supported.
The package can be installed directly from its github repository:
Usage is pretty straightforward. Start off by loading the package.
julia> using PhysicalConstants
Now, for example, access Earth’s gravitational acceleration in MKS units.
julia> PhysicalConstants.MKS.GravAccel 9.80665
Or in CGS units.
julia> PhysicalConstants.CGS.GravAccel 980.665
Or, finally, in Imperial units.
julia> PhysicalConstants.Imperial.GravAccel 32.174049