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. As the Moon orbits the Earth, we see different parts of the lighted area.

The revolution of the Moon around the Earth makes the Moon look as if it is changing shape in the sky.

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.

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The Moon passes through a cycle that repeats itself every 29.5 days. The phases always follow one another in the same order: New Moon Waxing Crescent First Quarter Waxing Gibbous Full Moon Waning Gibbous Third Quarter Waning Crescent

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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.

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.)

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.

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.)

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.

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.)

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.

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.)

Waxing & Waning

20 Eclipse The Sun and Moon occasionally line up so that we have an eclipse. These eclipses happen every year To see an eclipse, you need to be on a particular part of the Earth 20

21 Solar Eclipse When the Moon is between the Sun and Earth. “SME” When the Moon’s shadow covers part of the Earth Only happens at New Moon Total Solar Eclipse

22 Lunar Eclipse When the Earth is between the Sun and Moon. “SEM” When the Earth’s shadow covers the Moon The Earth’s atmosphere filters some sunlight and allows it to reach the Moon’s surface The blue light is removed—scattered down to make a blue sky over those in daytime and the remaining light is red or orange Some of this remaining light is bent or refracted so that a small fraction of it reaches the Moon

23 Tides The Moon’s gravity tugs on the Earth. It pulls the most on the part of Earth closest, which raises the atmosphere, the oceans, and even the rocks (a little) It pulls the least on the part of Earth that’s farthest, which allows the oceans and atmosphere to be further from the Moon (and higher) -The Sun’s gravity does the same thing, but to a lesser extent -Centripetal force causes the bulge on the far side.