Comment by davidkuhta
6 years ago
Hat tip to @nfriedly from back in 2011:
FYI units on OS X doesn't recognize millilightseconds, but you can do this:
You have: 3 lightyears / 365 / 24 / 60 / 60 / 1000
You want: miles
* 559.21802
/ 0.0017882113
or you can patch up the library file
GNU units is available through Homebrew, and does.
You can also type "3/1000 lightseconds to miles" in Google.
GNU Units is spectacular.