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Posted: July 23, 2015

Once in a Blue Moon is this Friday

By Eric Elwell, StormCenter 7 Chief Meteorologist

WHIO - Dayton, Ohio

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Have you ever told someone that “it only happens once in a blue moon?”

Well, that blue moon is about to happen! Look for it on Friday, July 31.

>> READ: 10 things to know about Friday's blue moon

The moon won't actually be blue.  So what is it?

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There are two definitions of a Blue Moon in astronomy; both are a type of full moon. (If the moon does look blue, it’s caused by a rare type of dust in the atmosphere.)

In astronomy, a Blue Moon is a full moon that doesn’t quite fit in with the months in our calendar.

There are two different ways of calculating which full moon is a Blue Moon.

  • Blue Moon = The third full moon in an astronomical season with 4 full moons (versus the normal 3)
  • Blue Moon = The second full moon in a month with two full moons.

That being said, the correct, original definition is that a “Blue Moon” is the third full moon in an astronomical season with four full moons.

A normal year has four astronomical seasons — spring, summer, fall and winter — with three months and normally three full moons each. When one of the astronomical seasons has four full moons, instead of the normal three, the third full moon is called a Blue Moon.

So now you know! (Or are you more confused?)

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The #1 Free Home Show in the Miami Valley is almost here

The event formerly known as Home World has a new name and new location. Get totally inspired for spring as you find hundreds of ways to improve your home. Make your home the one you really want. Show open daily during mall hours.  Admission is free! 

  • Landscaping and Outdoors

Get ready for Spring and Summer and transform your outdoor space into something that feels like you’re on vacation

  • Demonstration Stage

Make sure to visit our demonstration stage during the entire show. There will be exciting demonstrations on how to re-purpose and design thanks to Monarch Market Affair

  • Meet Barry Williams from The Brady Bunch 
  • Join us as we welcome Me-TV superstar Barry Williams who played the iconic Greg Brady from The Brady Bunch TV Show. Meet him and get an autograph on February 10th stage side at center court in front of Macy’s. 
  • The line will start forming when the Mall Opens, and Barry’s First appearance will be at 11 a.m.
  • Come prepared with your camera or cell phone for the Meet and Greet. 
  • There will be a Q&A session with Barry at 1 p.m. 
  • Enter to win a Me-TV Prize Pack and be the first to meet Barry Williams

For more information on this year’s big event and how your business can participate visit