Light from the setting sun reflects off the One World Trade Center tower as the moon rises in its waxing stage seen from The Heights neighborhood of Jersey City, N.J., Wednesday, July 29, 2015. The moon will reach its full stage Friday in a phenomenon known as the blue moon. (AP Photo/Julio Cortez)

Rare blue moon comes Friday

If anything unusual happens to you Friday, you’ll be right to say it was “once in a blue moon.”