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The Phases of the Moon

Phases of the Moon ..... moon phases ..... The moon tonight............
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The Moon travels around the Earth.

The revolution of the Moon around the Earth makes the Moon appear as if it is changing shape in the sky. From Earth we see the Moon grow from a thin crescent to a full disk (or full moon) and then shrink back to a thin crescent again before vanishing for a few days.

The Moon phases are produced by the alignment of the Moon and the Sun in the sky.
The lit part of the Moon always points the way to the Sun.

iconWhat is the phase of the moon?

The changing shape of the bright part of the Moon that we see is called its phase.

iconWhat causes part of the Moon to be lit up?

The moon is illuminated because it reflects the light from the sun. The part of the moon facing the sun is lit up. The part facing away from the sun is in darkness.

iconWhat causes the different phases of the Moon?

The phases of the Moon depend on its position in relation to the Sun and Earth. As the Moon makes its way around the Earth, we see the bright parts of the Moon's surface at different angles. These are called "phases" of the Moon.

iconWhat are the different phases of the Moon called?

The phases of the moon work in a cycle starting with the new moon.

Did you know?
Countries near the equator see the crescent moon shaped like a smile?

There are eight phases of the moon

The phases are named after how much of the moon we can see, and whether the amount visible is increasing, or decreasing each day.

Phases of the moon as seen in the Northern Hemisphere
Phases of the moon as seen in the Northern Hemisphere


Phases of the moon as seen in the Southern Hemisphere

It takes our Moon about 29.5 days to completely cycle through all eight phases. This is known as a Lunar month

Why are the phases different in each hemisphere?
The Moon orbits near the equator of the Earth. In the northern hemisphere, we're standing on the opposite side of the globe from countries in the southern hemisphere i.e. we are "upside down" from each other! We therefore see the Moon from a completely different vantage point from each other. Read more here
More about the different moon shapesnext page

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icon moon Introduction to phases icon moon Tips for Moon watching
icon moon Shapes of the Moon icon moon Moon around the world
icon moon Time to see each phase icon moon Facts about the Moon
icon moon Moon Calendar 2010 icon moon Moon animation

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