Earth's Motion

Earth's Movement in Space

Rotation

​Rotate - to spin around a center (axis)

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​Axis - an imaginary line that an object rotates around ​

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​Earth rotates on its axis one time every 24 hours

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Day and Night

Earth's rotation on its axis causes the day/night cycle:

• the sun to rise in the east and set in the west

• the apparent movement of the sun and moon

Revolution

​Revolve - to move around another object​​

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Orbit - the path that an object takes as it goes around another object​

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Earth revolves around the Sun ​one time every 365 days

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​​The Earth does this around the Sun on its orbital path.

Seasons

Earth's revolution around the Sun and tilt causes ​the seasons to change:

• ​As the Earth orbits the Sun, the amount of sunlight each location on the planet gets every day changes slightly.

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Different parts of Earth receive the Sun's most direct rays . So when the North pole tilts toward the Sun, its summer in the Northern Hemisphere. When the South pole tilts towards the Sun, its winter in the Northern Hemisphere.

Earth's tilt = 23.5 degrees

Fill in the Blank

How long does it take for Earth to make one complete rotation?

Fill in the Blank

How long does it take for Earth to make one complete revolution around the Sun?

What is an eclipse?

Eclipse

Occurs any time something passes​ in front of the Sun, blocking its light.

• This can be the Earth ​or the Moon

• When the Moon casts a shadow on the Earth, causing the Sun to go dark.

• The Moon comes between the Sun and Earth.

​Solar Eclipse

• When the Earth casts a shadow on the moon, causing the moon to go dark.

• Earth comes between the Sun and the Moon​.

Lunar Eclipse

Types of Eclipses

Lunar Eclipse

Solar Eclipse

Multiple Choice

During a lunar eclipse, where will the Moon be located?

• Position 1

• Position 2

• Position 3

• Position 4

Multiple Choice

During a solar eclipse, where will the Moon be located?

• Position 1

• Position 2

• Position 3

• Position 4

Asteroids

Comets

Other Celestial Bodies

Meteors

Comet

• Comets are celestial objects composed of ice and dust that emit a long, bright tail.

• Most ​exist in the Kuiper Belt or Oort Cloud.

Asteroids

• Irregularly- shaped bodies composed of rock and metal.

• Many asteroids are found in the region between Mars and Jupiter known as the asteroid belt.

• Generally do not have tails.​

Meteoroids

• A small rocky or metallic body in outer space.

• Meteoroids are significantly smaller than asteroids, and range in size from small grains to one-meter-wide objects.