Moon Phases.

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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 transcript:

Moon Phases

Half of the Moon is always lit up by the sun 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. Dark side of the moon? Only been seen from a space craft. http://www.nasm.si.edu/apollo30th/moontheater/phasepage2.html

Moon Phases 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

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

Moon Phases

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

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

New Moon

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.

First Quarter Moon

Third (Last) Quarter Moon Sometimes called Third 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.

Third Quarter Moon

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.

Full Moon

There are also four other phases of the Moon sometimes used.

("Waxing" means increasing, or growing larger.) Waxing Crescent Moon This Moon can be seen after the New Moon, but before the First Quarter Moon. The crescent will grow larger and larger every day, until the Moon looks like the First Quarter Moon. ("Waxing" means increasing, or growing larger.) http://btc.montana.edu/ceres/html/birthdayphases.html

Waxing Crescent Moon http://btc.montana.edu/ceres/html/birthdayphases.html

Waxing Gibbous Moon This Moon can be seen after the First Quarter Moon, but before the Full Moon. The amount of the Moon that we can see will grow larger and larger every day. ("Waxing" means increasing, or growing larger.) http://btc.montana.edu/ceres/html/birthdayphases.html

Waxing Gibbous Moon http://btc.montana.edu/ceres/html/birthdayphases.html

Waning Gibbous Moon This Moon can be seen after the Full Moon, but before the Last Quarter Moon. The amount of the Moon that we can see will grow smaller and smaller every day. ("Waning" means decreasing, or growing smaller.) http://btc.montana.edu/ceres/html/birthdayphases.html

Waning Gibbous Moon http://btc.montana.edu/ceres/html/birthdayphases.html

("Waning" means decreasing, or growing smaller.) Waning Crescent Moon This Moon can be seen after the Last Quarter Moon and before the New Moon. The crescent will grow smaller and smaller every day, until the Moon looks like the New Moon. ("Waning" means decreasing, or growing smaller.) http://btc.montana.edu/ceres/html/birthdayphases.html

Waning Crescent Moon http://btc.montana.edu/ceres/html/birthdayphases.html

Waxing & Waning http://www.nasm.si.edu/apollo30th/moontheater/phasepage4.html

Interesting Moon Facts Gravity is much weaker on the moon, due to its smaller mass. You would weigh 1/6 of your weight. No atmosphere 4.5 billion years old Moon theory The moon appears to move across the night sky because Earth is rotating on its axis. Revolves counterclockwise It would take 130 days to travel by car from the Earth to the moon. Rocket- 13 hrs Light speed- 1.52 sec No wind or weather Footprints will remain visible for 10 million years