Program moonlight calculates the relative amount of illumination at each hour on specified nights at a given location.
This is version 2.4 - released in December 2020
The code is copyright 1976, 2018, 2020 R.H. Austin, B.F. Phillips, D.J. Webb
It is released under licence GPL-3.0-or-later
The program is the one described in:
Austin, R.H., Phillips, B.F. and Webb, D.J. (1976) A method for calculation moonlight illuminance at the Earth's surface. J. Appl. Ecol., 13(3), 741-748.