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The full moon is the phase of the moon that occurs when the Moon lies on the opposite side of Earth from the Sun. The moon as seen from the surface of the earth is fully illuminated by the sun at this time, presenting a "full" round disc to viewers on earth. As always, only half the total surface of the moon is illuminated.
A full moon is the only time when a lunar eclipse is possible; at that time the moon may move through the shadow cast by the earth. However, because of the tilt of the moon's orbit around the earth relative to the earth's orbit around the sun, the moon may pass above or below the shadow, so a lunar eclipse does not occur at every full moon. Full moons are generally a poor time to conduct astronomical observations, since the bright reflected sunlight from the moon overwhelms the dimmer light from stars.
An approximate formula for the average time of full moon N is:
where D is the number of days (and fractions) since 1 January 2000 00:00:00 TT, and N is an integer.
To obtain this day expressed in UTC (world clock time) for future events (N > 0), apply the following approximate correction:
The true full moon may differ from this by more than 14 hours, due to periodic perturbations. The long-term error of the formula is approximately 1 × cy2 seconds in TT, and 11 × cy2 seconds in UT (cy is centuries since 2000); see the new moon page for a detailed explanation.
The age and apparent size of the full moon vary on cycle of just under 14 synodic months, which is called the full moon cycle.
Full moons are traditionally associated with insanity (hence the terms lunacy and lunatic) and with various unusual phenomena such as lycanthropyIn folklore, Lycanthropy is the ability or power of a human being to undergo transformation into an animal. The term comes from ancient Greek lykanthropos (Λυκανθρωποσ): lykos ("wolf") + anthr.
NeopagansNeopaganism (sometimes Neo-Paganism is a heterogeneous group of religions which claim to be a revival of mainly European Paganism. It is called Neopaganism by academics and many adherents to distinguish it from earlier forms of Paganism, from which it dif hold a monthly ritual called an EsbatWiccans and many other Pagans celebrate the esbats which are the full moons. The new moons are also celebrated by many groups, and some very dedicated groups also celebrate the first and last quarter. Traditionally, the Sabbats are times of celebration, w at each full moon.The traditional Chinese calendarThe Chinese calendar is a lunisolar calendar formed by combining a purely lunar calendar with a solar calendar. Among Chinese, the calendar is not used for most day to day activities, but is used for the dating of holidays such as Chinese New Year (Spring is based on the phases of the moon. The full moon is always the middle of a month. The Mid-Autumn FestivalThe Mid-Autumn Festival ( Chinese: ; pinyin: zhong qiu jie), Moon Festival or, less commonly, Mooncake Festival (; pinyin: yue bing jie) is a traditional Chinese festival / holiday falling on the 15th day of the 8th month of the Chinese lunar calendar (us falls on the full moon of the eighth month. The Lantern FestivalLantern Festival in Taiwan The Lantern Festival ( Traditional Chinese: ; pinyin: yuanxiaujie) is a traditional Chinese festival/ holiday, which is celebrated by the Chinese in many countries. On the Chinese calendar (a lunar calendar), the Lantern Festiva falls on the first full moon of the year. Many religious Chinese people prepare their ritualistic offerings to their ancestors and deities on every full moon and new moon.
| Month | Names | Other Names Used |
|---|---|---|
| January | Wolf Moon | Old Moon |
| February | Snow Moon | Hunger Moon |
| March | Worm Moon | Crow Moon, Crust Moon, Sugar Moon, Sap Moon |
| April | Pink Moon | Sprouting Grass Moon, Egg Moon, Fish Moon |
| May | Flower Moon | Corn Planting Moon, Milk Moon |
| June | Strawberry Moon | Rose Moon, Hot Moon |
| July | Buck Moon | Thunder Moon, Hay Moon |
| August | Sturgeon Moon | Red Moon, Green Corn Moon |
| September | Harvest Moon | Corn Moon, Barley Moon |
| October | Hunter's Moon | Travel Moon, Dying Grass Moon |
| November | Beaver Moon | Frost Moon |
| December | Cold Moon | Long Nights Moon |
| These are the traditional names given to each month's Full Moon by Native AmericanNative Americans (also Indians Aboriginal Peoples American Indians First Nations Alaskan Natives or Indigenous Peoples of America are the indigenous inhabitants of Americas prior to the European colonization, and their modern descendants. This term compris in the northern and eastern United States. The Moon was used to track the seasons. (From Farmer's Almanac) | ||