Once in a blue moon!

We’ve all heard the phrase (and maybe if we’re older than 21, popped the cap on one), but have you ever wondered what the phrase means?
CaptureA blue moon is simply the second full moon that occurs within a calendar month. But Shirley Ryan in Oregon, Illinois wants to know “If a full moon occurs every 29.5 days, how can we possibly have a second full moon in August on the 21st?” That’s because this blue moon is a “Seasonal Blue Moon,” which means it’s the fourth full moon in a season (not┬ásticking to our traditional definition)! According to Space.com, the “second full moon in a calendar month” was a mistake from a 1940s “Sky and Telescope” article that stuck!)

Let’s go further.┬áSince the lunar cycle is different than our calendar (which determines the length of one year as 365.25 days), we accumulate extra days within the lunar cycle!

While “traditional blue moons” occur more often than the phrase leads you to believe, a “Seasonal Blue Moon” won’t occur again until until 2016!

With the added haze in the air, the moon will take on an extra-orange look during moonrise and moonset. If you don’t live in the Rockford, Illinois area, you can use this link to find the moonrise and moonset in your area.

Who’s up for a toast to the Blue Moon with a Blue Moon? -Eric


Posted under event, news, science, space, statistics, weather geek

This post was written by qni_it on August 19, 2013

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