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As Earth Rotates: The Effects of the Rotation of the Earth.

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Presentation on theme: "As Earth Rotates: The Effects of the Rotation of the Earth."— Presentation transcript:

1 As Earth Rotates: The Effects of the Rotation of the Earth

2 What is Astronomy? Astronomy is the scientific study of matter in outer space. It is known as the 1 st science because of written astronomical observations by the Babylonians around 1600 B.C. It is known as the 1 st science because of written astronomical observations by the Babylonians around 1600 B.C.

3 Earth, Moon, and Sun: The Moon revolves around the Earth. The Moon revolves around the Earth. The Earth revolves around the Sun. The Earth revolves around the Sun.

4 Earth’s Orbit: Earth’s orbit (path) around the Sun is NOT a perfect circle. Earth’s orbit (path) around the Sun is NOT a perfect circle. Earth’s orbit is an elongated circle, or an ellipse. Earth’s orbit is an elongated circle, or an ellipse.

5 Earth’s Revolution: It takes Earth 365 ¼ days to complete one revolution around the Sun = 1 year. It takes Earth 365 ¼ days to complete one revolution around the Sun = 1 year.

6 Earth’s Orbit

7 Earth’s Axis: Earth’s axis is an imaginary line through the center of the Earth from the North Pole to the South Pole. Earth’s axis is an imaginary line through the center of the Earth from the North Pole to the South Pole. Earth’s axis is tilted 23.5° Earth’s axis is tilted 23.5°

8 Earth’s Axis

9 Earth’s Rotation: Every 24 hours, Earth rotates, or turns around its axis. One complete turn of Earth is called a rotation = 1 day.

10 Earth’s Rotation: Earth’s rotation is what causes day and night. Earth’s rotation is what causes day and night.

11 PlanetRevolutionRotation Mercury88 days58 days Venus224 days243 days Earth365 days24 hours Mars687 days24.6 hours Jupiter12 years10 hours Saturn29 years10 hours Uranus84 years18 hours Neptune165 years19 hours *Pluto248 years6 days

12 Reason for the Seasons: Earth has seasons because its axis is tilted as it revolves around the Sun. Earth has seasons because its axis is tilted as it revolves around the Sun.

13 Earth’s Tilt and Seasons: Earth’s tilt puts part of Earth into the Sun’s rays at a more direct angle than other parts. Earth’s tilt puts part of Earth into the Sun’s rays at a more direct angle than other parts.

14 Earth’s Tilt and Seasons: When a part of Earth tilts toward the Sun, the Sun is higher in the sky and its rays hit that section at a higher angle = rays are closer together = more effective at heating Earth. When a part of Earth tilts toward the Sun, the Sun is higher in the sky and its rays hit that section at a higher angle = rays are closer together = more effective at heating Earth.

15 Earth’s Tilt and Seasons: In June, the Northern Hemisphere of the Earth (where we live) is tilted toward the Sun = summer. In June, the Northern Hemisphere of the Earth (where we live) is tilted toward the Sun = summer. The Southern Hemisphere = winter. The Southern Hemisphere = winter.

16 Earth’s Tilt and Seasons: In December, the Northern Hemisphere of the Earth is tilted away from the Sun = winter. In December, the Northern Hemisphere of the Earth is tilted away from the Sun = winter. The Southern Hemisphere = summer. The Southern Hemisphere = summer.

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18 Earth’s Tilt and Daylight: The tilt of the Earth affects the length of daylight. The tilt of the Earth affects the length of daylight. Higher Sun = more daylight = more time for Sun’s rays to heat Earth.

19 Summer Solstice: Around June 21 st is the longest day and highest angle of sunlight. Around June 21 st is the longest day and highest angle of sunlight. It is known as the summer solstice. It is known as the summer solstice.

20 Winter Solstice: Around December 21 st is the shortest day and lowest angle of sunlight. Around December 21 st is the shortest day and lowest angle of sunlight. It is known as the winter solstice. It is known as the winter solstice.

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22 Equinox: Happens twice a year on first days of spring and fall. Happens twice a year on first days of spring and fall. Sun directly above equator and equal hours of daylight and night (12 hours). Sun directly above equator and equal hours of daylight and night (12 hours).

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