Definition of tropical month
: a period that equals the mean time of the moon's revolution from any point of the ecliptic back to the same point and amounts to 27 days, 7 hours, 43 minutes, and 4.7 seconds of mean solar time
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
First Known Use of tropical month
Seen and Heard
What made you want to look up tropical month? Please tell us where you read or heard it (including the quote, if possible).