A "blue moon" is the second full moon in a month, which happens every two to three years. The use of the term "blue moon," meaning infrequently reoccurring, dates to 1821.
Post-Crescent, 7-30-1985; Oxford English Dictionary
See the Sky and Telescope article What's a Blue Moon? or the Blue Moon web site for more information.
Send a Question or Comment to Appleton Public Library.
9am - 9pm Monday-Thursday
9am - 6pm Friday
9am - 5pm Saturday
noon - 5pm Sunday
Seasonal Hours & Closings
Reasonable accommodations for persons with disabilities will be made upon request and if feasible.
Member of the Outagamie-Waupaca Library System.©2016 Appleton Public Library 225 N Oneida St, Appleton, WI 54911 920-832-6173