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Moon Phase Names

The phases of the Moon have been given the following names,
in sequential order:
Phase Northern Hemisphere Southern Hemisphere Visibility Standard time of culmination (mid-phase)
New moon Not visible, traditionally Moon's first visible crescent after sunset 12 noon
Waxing crescent moon Right 1–49% visible Left 1–49% visible afternoon and post-dusk 3 pm
First quarter moon Right 50% visible Left 50% visible afternoon and early night 6 pm
Waxing gibbous moon Right 51–99% visible Left 51–99% visible late afternoon and most of night 9 pm
Full moon Fully visible Fully visible sunset to sunrise (all night) 12 midnight
Waning gibbous moon Left 51–99% visible Right 51–99% visible most of night and early morning 3 am
Third quarter moon Left 50% visible Right 50% visible late night and morning 6 am
Waning crescent moon Left 1–49% visible Right 1–49% visible pre-dawn and morning 9 am
Dark moon Not visible, traditionally Moon's last visible crescent before sunrise 12 noon


When the Sun and Moon are aligned on the same side of the Earth the Moon is "new", and the side of the Moon visible from Earth is not illuminated by the Sun. As the Moon waxes (the amount of illuminated surface as seen from Earth is increasing), the lunar phases progress from new moon, crescent moon, first-quarter moon, gibbous moon and full moon phases, before returning through the gibbous moon, third-quarter (or last quarter) moon, crescent moon and new moon phases. The terms old moon and new moon are interchangeable, although new moon is more common. Half moon is often used to mean the first- and third-quarter moons, while the term 'quarter' refers to the extent of the moon's cycle around the Earth, not its shape.

Related Source:
http://en.wikipedia.org/wiki/Lunar_phase
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