NEXT BLUE MOON:The expression “Once in a Blue Moon”
refers to a month in which Two Full Moons
occur and happens only every few years. The Moon can sometimes appear bluish because of atmospheric conditions. The expression 'once in a blue moon' came about because we rarely have a month with two full moons. This happens only once every few years!! And, in 2016 there are no Blue Moons!
A Harvest Moon is no ordinary Full Moon; it behaves in a special way. Throughout the year the Moon generally rises about 50 minutes later each day. Near the autumn equinox the day-to-day difference in the local time of moonrise is only 30 minutes. That comes in handy for northern farmers who are working long days to harvest their crops before autumn. The extra dose of lighting afforded by the Full Moon is what gives the Harvest Moon its name.