moon diameter	geographic width	geographic length
example	200 (pixel)	52.51 (°) N (north) = Berlin *	13.41 (°) E (east) = Berlin
input
	background color	color of dark moon	color of enlighted moon
example	# 00000000 (transparent *)	# 888888 (gray, opak)	# FFFFFF (white, opak)
input	#	#	#
	<img src="" />