physics question #332

Gary John Walsh, a 40 year old male from the Internet asks on February 9, 1998,


What is a blue moon? When will the next one be? Are there ever two in the same year?

viewed 13346 times

the answer

Barry Shell answered on February 9, 1998, A:

Depending on your source, a blue moon means either when a second full moon comes in one calendar month OR (according the Maine Almanac), when a season (Spring, Summer, Fall, Winter) has four full moons, rather than the usual three. For more information, including a calendar of upcoming blue moons, check out the Sky & Telescope website.

Add to or comment on this answer using the form below.
(required if you would like a response)
Note: All submissions are moderated prior to posting.
If you found this answer useful, please consider making a small donation to