MERCU has various meanings in the Scientific & Educational category. Discover the full forms, definitions, and usage contexts of MERCU in Scientific & Educational.
Innermost of the planets Greatest angular distance from Sun is about 29deg. Very rarely observable, and then only near sunrise or sunset. Nautical almanac then gives a warning that its appearance may cause it to be mistaken for a star or another planet.
Scientific & EducationalLast updated: