Phases, Eclipses, and Tides Chapter 19-2. Motions of the Moon As the moon moves, the positions of the moon, Earth, and the sun change in relation to each.

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Presentation transcript:

Phases, Eclipses, and Tides Chapter 19-2

Motions of the Moon As the moon moves, the positions of the moon, Earth, and the sun change in relation to each other. As the moon moves, the positions of the moon, Earth, and the sun change in relation to each other. The positions of the moon, Earth, and the sun cause the phases of the moon, eclipses, and tides. The positions of the moon, Earth, and the sun cause the phases of the moon, eclipses, and tides.

The moon revolves around Earth about once every 27.3 days. It also rotates on its own axis about once every 27.3 days. The moon revolves around Earth about once every 27.3 days. It also rotates on its own axis about once every 27.3 days. The same side of the moon always faces Earth. The same side of the moon always faces Earth. A “day” and a “year” on the moon are the same length. A “day” and a “year” on the moon are the same length.

Phases of the Moon The different shapes of the moon you see from Earth are called phases. The different shapes of the moon you see from Earth are called phases. Phases are caused by changes in the relative position of the moon, Earth, and sun. Phases are caused by changes in the relative position of the moon, Earth, and sun. The phase of the moon you see depends on how much of the sunlit side of the moon faces Earth. The phase of the moon you see depends on how much of the sunlit side of the moon faces Earth.

Eclipses When the moon’s shadow hits Earth or Earth’s shadow hits the moon, an eclipse occurs. When the moon’s shadow hits Earth or Earth’s shadow hits the moon, an eclipse occurs. An eclipse occurs when an object in space comes between the sun and a third object, and casts a shadow on that object. An eclipse occurs when an object in space comes between the sun and a third object, and casts a shadow on that object.

Types of eclipses There are two types of eclipses: solar and lunar. There are two types of eclipses: solar and lunar. A solar eclipse occurs when the moon passes between Earth and the sun, blocking the sunlight from reaching Earth. A solar eclipse occurs when the moon passes between Earth and the sun, blocking the sunlight from reaching Earth. The moon’s shadow then hits Earth. The darkest part of the moon’s shadow is called the umbra. The moon’s shadow then hits Earth. The darkest part of the moon’s shadow is called the umbra.

Solar eclipse From any part of the umbra, the moon completely blocks light from the sun. Only people in the umbra see a total solar eclipse. Another part of the shadow is less dark and larger than the umbra. It is called the penumbra. From any part of the umbra, the moon completely blocks light from the sun. Only people in the umbra see a total solar eclipse. Another part of the shadow is less dark and larger than the umbra. It is called the penumbra. From within the penumbra, people see a partial eclipse, because part of the sun is still visible. From within the penumbra, people see a partial eclipse, because part of the sun is still visible.

Lunar eclipse A lunar eclipse occurs at a full moon when Earth is directly between the moon and the sun. During a lunar eclipse, Earth’s shadow falls on the moon. Earth’s shadow also has an umbra and a penumbra. A lunar eclipse occurs at a full moon when Earth is directly between the moon and the sun. During a lunar eclipse, Earth’s shadow falls on the moon. Earth’s shadow also has an umbra and a penumbra. When the moon is completely within Earth’s umbra you see a total lunar eclipse. A partial lunar eclipse happens when the moon moves partly into Earth’s umbra. When the moon is completely within Earth’s umbra you see a total lunar eclipse. A partial lunar eclipse happens when the moon moves partly into Earth’s umbra.

Tides Tides are the rise and fall of the ocean’s water every 12.5 hours or so. Tides are the rise and fall of the ocean’s water every 12.5 hours or so. The force of gravity pulls the moon and Earth toward each other. The force of gravity pulls the moon and Earth toward each other. Tides occur mainly because of differences in how much the moon pulls on different parts of Earth. Tides occur mainly because of differences in how much the moon pulls on different parts of Earth. As Earth rotates, the moon’s gravity pulls water toward the point on Earth’s surface closest to the moon. The moon pulls least on the side of Earth farthest away. Tides occur because of this difference in the pull of the moon’s gravity. In most places, there are two high tides each day. As Earth rotates, the moon’s gravity pulls water toward the point on Earth’s surface closest to the moon. The moon pulls least on the side of Earth farthest away. Tides occur because of this difference in the pull of the moon’s gravity. In most places, there are two high tides each day.