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As Earth Rotates:

As Earth Rotates:. The Effects of the Rotation of the Earth. 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. Earth, Moon, and Sun.

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As Earth Rotates:

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  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 1st 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 Earth revolves around the Sun.

  4. Earth’s Orbit: • Earth’s orbit (path) around the sun is NOT a perfect circle. • 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.

  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 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.

  11. Reason for the Seasons: • Earth has seasons because its axis is tilted as it revolves around the sun.

  12. 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.

  13. 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.

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

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

  16. Earth’s Tilt and Daylight: • The tilt of the Earth effects the length of daylight. • Higher sun = more daylight = more time for Sun’s rays to heat Earth.

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

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

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

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