Full moon
Full Moon
The Full Moon (pronunciation: /fʊl muːn/) is a phase of the Moon where it appears fully illuminated from Earth's perspective. This occurs when Earth is located directly between the Sun and the Moon (more exactly, when the ecliptic longitudes of the Sun and Moon differ by 180°). This means that the lunar hemisphere facing Earth – the near side – is completely sunlit and appears as a circular disk, while the far side is dark.
Etymology
The term "Full Moon" originates from the Old English term "fulle mōna". The word "full" comes from the Old English "ful" meaning "full, filled, abundant", and "moon" comes from the Old English "mōna", which is related to the Latin word "mensis" meaning "month", indicating the moon's use in tracking time.
Related Terms
- New Moon: The phase of the Moon during which it is in conjunction with the Sun and invisible from Earth, or shortly thereafter when it appears as a slender crescent.
- Blue Moon: A phenomenon where an additional full moon appears in a given period.
- Lunar Eclipse: An event that occurs when the Moon passes directly behind Earth and into its shadow, often resulting in a reddish color.
- Lunar Cycle: The process of the Moon's phases, from new moon to full moon and back again.
- Lunar Phase: The shape of the directly sunlit portion of the Moon as viewed from Earth.
External links
- Medical encyclopedia article on Full moon
- Wikipedia's article - Full moon
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