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Moon Phases. Half of the Moon is always lit up by the sun. As the Moon orbits the Earth, we see different parts of the lighted area.

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Presentation on theme: "Moon Phases. Half of the Moon is always lit up by the sun. As the Moon orbits the Earth, we see different parts of the lighted area."— Presentation transcript:

1 Moon Phases

2 Half of the Moon is always lit up by the sun. As the Moon orbits the Earth, we see different parts of the lighted area. http://www.nasm.si.edu/apollo30th/moontheater/phasepage2.html

3 The revolution of the Moon around the Earth makes the Moon look as if it is changing shape in the sky. http://btc.montana.edu/ceres/html/birthdayphases.htm

4 This is caused by the different angles from which we see the lighted part of the Moon's surface. These are called "phases" of the Moon. http://btc.montana.edu/ceres/html/birthdayphases.htm

5 The Moon passes through four major shapes during a cycle that repeats itself every 29.5 days. The phases always follow one another in the same order: New moon First quarter Third quarter Full moon

6 New Moon The lighted side of the Moon faces away from the Earth. This means that the Sun, Earth, and Moon are almost in a straight line, with the Moon in between the Sun and the Earth. The Moon that we see looks very dark

7 New Moon

8 First Quarter Moon The right half of the Moon appears lighted and the left side of the Moon appears dark. During the time between the New Moon and the First Quarter Moon, the part of the Moon that appears lighted gets larger and larger every day, and will continue to grow until the Full Moon.

9 First Quarter Moon

10 Last Quarter Moon Sometimes called Last Quarter. The left half of the Moon appears lighted, and the right side of the Moon appears dark. During the time between the Full Moon and the Last Quarter Moon, the part of the Moon that appears lighted gets smaller and smaller every day. It will continue to shrink until the New Moon, when the cycle starts all over again.

11 Last Quarter Moon

12 Full Moon The lighted side of the Moon faces the Earth. This means that the Earth, Sun, and Moon are nearly in a straight line, with the Earth in the middle. The Moon that we see is very bright from the sunlight reflecting off it.

13 Full Moon

14 http://www.opencourse.info/astronomy/introduction/04.motion_moon/moon_phases.gif

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