Use `flake8` and `mypy` type checking to improve correctness * Python >= 3.6 required
1.6.4
1.6.3
This speeds up massively repeated operations of these functions--convert once to radians beforehand instead of each time (optionally)
1.6.2
Lots of little improvements:
* cleaned up Python self-test and improved coverage via argument expansion * added AppVeyor (windows testing) * published in [](https://doi.org/10.21105/joss.00580) * using Ctest
1.6.1
* Fixed incorrect calculations with "radians" input angles to Fortran code. * allowed "err_mag" text message for assert_isclose() in Fortran and Matlab code, like Python * improved test coverage in Fortran and Python.
1.6.0
Corrected names of anglesep (angular separation) formulas.