Astronomy Picture of the Day . On a Blue Moon . ... 1.09.2012 . ... Credit Copyright: Simon Smith Explanation: Rising at sunset, the gorgeous Full Moon of August 31 became the second Full Moon in a month. According to modern reckoning , that makes it a Blue Moon. In fact, parts of the Full Moon do look a little blue in this sharp lunar portrait . ... Publications with keywords: blue moon - full moon . Publications with words: blue moon - full moon . ... Perigee s Full Moon . ...