Once in a blue moon !

Most definitions say that a blue moon is the second full moon in a calendar month.

D58R0603 from RAW _1This year, July’s first full moon was on the 2nd. Because there are 29.5 days between full moons (known as the lunar month), here we are again at full moon on 31st.

To see more photos of this rare event (next is 2018) click here