Lunar Phases of the Moon

Full Moon: The Moon appears entirely illuminated. It's a primary phase.Waning Gibbous: The Moon appears to be more than half, but not fully, illuminated. The illumination is decreasing. (Decreasing illumination starts on the right side.)

Waxing Gibbous: The Moon appears to be more than half illuminated.

First Quarter: Half of the Moon appears to be illuminated. It's a primary phase.

First QuarterWaxing Gibbous

Full MoonWaning Gibbous

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New Moon: The Moon's dark side is facing the Earth. The Moon is not visible until a solar eclipse. It's a primary phase.

Waxing Crescent: The Moon appears to be less than half illuminated by direct sunlight. The illuminated fraction is increasing. (Increased illumination starts on the right side.)

Last Quarter: Half of the Moon appears to be illuminated by direct sunlight. (Opposite side illuminated as first quarter.) It's a primary phase.Waning Crescent: The Moon appears to be less than half illuminated.

Last QuarterWaning Crescent

Lunar Phases of the Moon

New MoonWaxing Crescent

The lunar month is the 29.53 days it takes to go from one new moon to the next. During the lunar month, the Moon goes though all its phases. Like the Earth, half of the Moon is lit by the Sun while the other half is in darkness. The phases we see result from the angle the Moon makes with the Sun as viewed from Earth.

Background Information

New Moon

Waxing Crescent

First Quarter

Waxing Gibbous

Full Moon

Waning Gibbous

Last Quarter

Waning Crescent