How often does a Full Moon occur twice in a single month? Exactly once in a Blue Moon. In fact, the modern usage of the term "Blue Moon" refers to the second Full Moon in a single month. Tonight's Blue Moon (Universal Time) will be the first since September 1993. A Blue Moon typically occurs every few years. The reason for the rarity of the Blue Moon is that the 29.53 days between full moons is just slightly shorter than the number of days in the average month. Don't, however, expect the moon to look blue tonight! The term "Blue Moon" is thought to derive from common language e-pressions used hundreds of years ago. It is possible for the Moon to appear tinged by a blue hue, sometimes caused by fine dirt circulating in the Earth's atmosphere, possibly from a volcanic explosion. The above picture is of our Moon taken was taken in a dark blue morning sky. The bright crescent is the only part directly exposed to sunlight - the rest of the Moon glows from sunlight reflected from the Earth. In this dramatic photo, however, the planet Jupiter is also visible along with its four largest moons. Credit and Copyright: Vic Winter, ICSTARS 한달에 보름이 두번 있을때가 있는데 달의 공전주기가 29.53일이기 때문에 우리의 평균 달보다 날이 적어서 드물게 그런 일이 생긴답니다. 저 뒤로 보이는 빛나는 별은 목성이고 그 옆의 작은 별들은 목성의 4대위성들입니다. (목성의 4대위성 - 이오, 칼리스토, 에우로파, 가니메데)
Blue Moon
How often does a Full Moon occur twice in a single month? Exactly once in a Blue Moon. In fact, the modern usage of the term "Blue Moon" refers to the second Full Moon in a single month. Tonight's Blue Moon (Universal Time) will be the first since September 1993. A Blue Moon typically occurs every few years. The reason for the rarity of the Blue Moon is that the 29.53 days between full moons is just slightly shorter than the number of days in the average month. Don't, however, expect the moon to look blue tonight! The term "Blue Moon" is thought to derive from common language e-pressions used hundreds of years ago. It is possible for the Moon to appear tinged by a blue hue, sometimes caused by fine dirt circulating in the Earth's atmosphere, possibly from a volcanic explosion. The above picture is of our Moon taken was taken in a dark blue morning sky. The bright crescent is the only part directly exposed to sunlight - the rest of the Moon glows from sunlight reflected from the Earth. In this dramatic photo, however, the planet Jupiter is also visible along with its four largest moons.
Credit and Copyright: Vic Winter, ICSTARS
한달에 보름이 두번 있을때가 있는데 달의 공전주기가 29.53일이기 때문에 우리의 평균 달보다 날이 적어서 드물게 그런 일이 생긴답니다. 저 뒤로 보이는 빛나는 별은 목성이고 그 옆의 작은 별들은 목성의 4대위성들입니다. (목성의 4대위성 - 이오, 칼리스토, 에우로파, 가니메데)