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Relationships Between Sun, Earth, Moon

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grace ray

on 14 March 2011

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Transcript of Relationships Between Sun, Earth, Moon

The Functions of the Sun, Earth, and Moon Tides:
Movements in ocean waters that change the level of water. This effect is caused by the Moon's gravity pulling at the Earth The acceleration of gravity on Earth due to the Sun, is 177 greater than the gravity on Earth from the Moon. The Earth revolves around the Sun and the Moon orbits around us. The Sun provides light for us during the day. The Moon provides light for Earth at night; the Moon gets its light from the reflection of light from the sun. When the sun and moon are aligned, there are exceptionally strong gravitational forces, causing very high and very low tides which are called spring tides, though they have nothing to do with the season. When the sun and moon are not aligned, the gravitational forces cancel each other out, and the tides are not as dramatically high and low. These are called neap tides. Spring tide Neap tide The Moon completes its orbit around the Earth in approximately 27.3 days (a sidereal month). It is like the Moon and Earth are having a race. The Earth moves 45 million miles around the Sun, while the Moon still has to catch up to orbit the Earth. The Moon takes 27.3 days to orbit Earth, but the lunar phase cycle (from new Moon to new Moon) is 29.5 days Moon Phases: The Moon has phases because it orbits the Earth, which causes the portion we can see to be illuminated Eclipse: when the shadow of one celestial body fulls on another Lunar eclipse: when the Earth comes between the Sun and the Moon; the shadow falls on the Moon. Solar eclipse: when the Moon comes between the Earth and Sun; the shadown of the Moon falls on the part of Earth. Annular eclipse: then ring of sunlight shows around the outer edge of the Moon. Eclipses: Review questions: 1. What is a Spring Tide? When the sun and moon are aligned causing high and low tides. 2. What is a Neap Tide? When the sun and moon are not aligned causing the gravitaional forces to cancel each other out. This causes dramatically low tides. 3. Which one orbits Sun, moon, or Earth? Moon orbits around the Earth Like the Earth, the Moon is a sphere which is always half illuminated by the Sun, but as the Moon orbits the Earth we get to see more or less of the illuminated half. During each lunar orbit (a lunar month), we see the Moon's appearance change from not visibly illuminated through partially illuminated to fully illuminated, then back through partially illuminated to not illuminated again. The phases designate both the degree to which the Moon is illuminated and the piece appearance of the illuminated part. These phases of the Moon, in the sequence of their occurrence (starting from New Moon), are listed below.

New Moon - The Moon's unilluminated side is facing the Earth. The Moon is not visible (except during a solar eclipse).

Waxing Crescent - The Moon appears to be partly but less than one-half illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is increasing.

First Quarter - One-half of the Moon appears to be illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is increasing.

Waxing Gibbous - The Moon appears to be more than one-half but not fully illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is increasing.

Full Moon - The Moon's illuminated side is facing the Earth. The Moon appears to be completely illuminated by direct sunlight.

Waning Gibbous - The Moon appears to be more than one-half but not fully illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is decreasing.

Last Quarter - One-half of the Moon appears to be illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is decreasing.

Waning Crescent - The Moon appears to be partly but less than one-half illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is decreasing. The Sun is the source of energy and light for all the planets. Each planet has its own position around the solar system. The Earth happens to be the third planet away from the Sun. There are currently eight planets; there used to be nine until they discovered Pluto was not a planet. Review questions:
1. What is the difference between a solar eclipse and a lunar eclipse? Lunar eclipse is when the Earth comes between the moon and the Sun, and in the solar eclipse the moon comes between Sun and Earth. 2. What moon phase comes right after the New moon? waxing cresent 3. Draw a diagram of the wanning cresent. Our seasons are created by the Earth spining on its axis.
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