This is a halo -- the radius of the inner ring to the Sun. It's the most frequently observed of the circular halos. Randomly oriented, hexagonal ice crystals in cirrus clouds are responsible for its formation.
The next Blue Moon is August A Blue Moon is the second full moon of the calendar month. August 2012 is a month with two full moons a Blue Moon month – but it’s Blue in name only. The first full moon is August