The tropical month is the period from one lunar equinox to the next. In 1994-2000, it was 27.321582 days long.
Anomalistic Month, Draconic Month, Month, Sidereal Month, Synodic Month, Tropical Year
United States Government Printing Office. The Astronomical Almanac for the Year 2000. Washington, DC: Navy Dept., Naval Observatory, Nautical Almanac Office, p. D2, 2000.
Anomalistic Month, Draconic Month, Month, Sidereal Month, Synodic Month, Tropical Year
