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Seasonal ChangesSeasonal ChangesSeasonal ChangesSeasonal Changes Earth’s Tilt and Rotation.

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Presentation on theme: "Seasonal ChangesSeasonal ChangesSeasonal ChangesSeasonal Changes Earth’s Tilt and Rotation."— Presentation transcript:

1 Seasonal ChangesSeasonal ChangesSeasonal ChangesSeasonal Changes Earth’s Tilt and Rotation

2 Axis: The imaginary line that runs through the poles at a tilt of 23 ½ degrees. The imaginary line that runs through the poles at a tilt of 23 ½ degrees. The axis NEVER changes its tilt direction. It remains at the same tilt as the earth revolves around the sun. The axis NEVER changes its tilt direction. It remains at the same tilt as the earth revolves around the sun. Because the earth spins on this tilted axis all parts of the earth DO NOT receive the same amount of sunlight. Because the earth spins on this tilted axis all parts of the earth DO NOT receive the same amount of sunlight.

3 Revolution: The movement of the earth around the sun. (Takes 365 days and 6 hours) to make 1 revolution. The movement of the earth around the sun. (Takes 365 days and 6 hours) to make 1 revolution. The revolution and axis tilt determine the seasons of the year. The revolution and axis tilt determine the seasons of the year. March 21st/22nd the sun is directly over the equator. March 21st/22nd the sun is directly over the equator.

4 March 21st/22nd Equinox The sun is directly over the equator. The sun is directly over the equator. The number of daylight and night time hours are equal (12 and 12) The number of daylight and night time hours are equal (12 and 12) This marks the beginning of Spring in the Northern Hemisphere and the Beginning of Fall in the Southern Hemisphere. This marks the beginning of Spring in the Northern Hemisphere and the Beginning of Fall in the Southern Hemisphere.

5 September 23rd Equinox: The sun is directly over the equator again. The sun is directly over the equator again. This marks the beginning of Fall in the Northern Hemisphere This marks the beginning of Fall in the Northern Hemisphere Also marks the beginning of Spring in the Southern Hemisphere. Also marks the beginning of Spring in the Southern Hemisphere.

6 June 21st/22nd Solstice The sun is directly over the Tropic of Cancer (23 ½ degrees N) The sun is directly over the Tropic of Cancer (23 ½ degrees N) In the Northern Hemisphere this is when there is the greatest amount of daylight hours and marks the beginning of summer. In the Northern Hemisphere this is when there is the greatest amount of daylight hours and marks the beginning of summer. Southern Hemisphere is where there is the shortest amount of daylight hours and marks the beginning of winter. Southern Hemisphere is where there is the shortest amount of daylight hours and marks the beginning of winter.

7 December 22nd Winter Solstice The sun is directly over the Tropic of Capricorn (23 ½ degrees S) The sun is directly over the Tropic of Capricorn (23 ½ degrees S) Northern Hemisphere has the least amount of daylight hours and marks the first day of winter. Northern Hemisphere has the least amount of daylight hours and marks the first day of winter. Southern Hemisphere has the most amount of daylight hours and marks the first day of summer. Southern Hemisphere has the most amount of daylight hours and marks the first day of summer.

8 The Poles

9 North Pole At the North Pole the sun never sets between March 20th– September 23rd. At the North Pole the sun never sets between March 20th– September 23rd. There is constant daylight 24 hours a day. There is constant daylight 24 hours a day.

10 Fortress of Solitude

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19 South Pole At the South Pole it is reversed. At the South Pole it is reversed. September 23rd- March 20th the sun never sets. (Meaning Constant Daylight) September 23rd- March 20th the sun never sets. (Meaning Constant Daylight)

20 THE POLES (BOTH) For 6 months a year there is either constant darkness or constant daylight. For 6 months a year there is either constant darkness or constant daylight. Midnight Sun is the term for constant daylight. Midnight Sun is the term for constant daylight.

21 Effects of Midnight Sun Constant sun or constant darkness alters lifestyles in terms of: Constant sun or constant darkness alters lifestyles in terms of: Food expenses Food expenses Human internal functions Human internal functions Electric bills Electric bills Human mental state (State of mind) Human mental state (State of mind)

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