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Days, Years

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Days, Years & Seasons Days and Nights Rotation: the Earth turns around on its axis 1 day=24 hours (one rotation) One half of the Earth is always in light and one half ... – PowerPoint PPT presentation

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Title: Days, Years


1
Days, Years Seasons
2
Days and Nights
  • Rotation the Earth turns around on its axis
  • 1 day24 hours (one rotation)
  • One half of the Earth is always in light and one
    half is always in darkness
  • List some examples of rotation

3
Years
  • Revolution the Earth moves around the sun
  • 1 year365 1/4 days (one revolution)
  • List some examples of revolutions

4
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8
What REALLY causes the seasons?
  • The Earth is tilted as it revolves around the
    sun.

9
Seasons (summer, fall, winter, spring)
  • The Earths axis is tilted 23 1/2 degrees from
    vertical
  • The tilt is always oriented the same way and
    causes the four seasons
  • The 23 1/2 degree tilt causes the sunlight to
    follow a different path across the Earths
    surface

10
Summer Solstice June 21
  • The Earths Northern Hemisphere is tilted towards
    the sun

11
Summer Solstice
  • More direct energy (heat) enters the atmosphere
  • There is 24 hours of daylight at the North Pole
    and 24 hours of darkness at the South Pole
  • The longest day of the year
  • Aphelion the Earth is the farthest from the sun
    (94 million miles)

12
Winter Solstice December 21
  • The Earths Northern Hemisphere is tilted away
    from the sun

13
Winter Solstice
  • The suns energy (heat) is more concentrated in
    the Southern Hemisphere
  • There is 24 hours of daylight at the South Pole
    and 24 hours of darkness at the North Pole
  • The shortest day of the year
  • Perihelion the Earth is the closest to the sun
    (91 million miles)

14
What happens when the Earth is not tilted toward
or away from the sun?
HERE
And HERE
15
Equinox
  • The Earth is not tilted toward or away from the
    sun
  • Spring Equinox March 21
  • Fall Equinox September 21
  • There are 12 hours of daylight and 12 hours of
    darkness from the North Pole to the South Pole
  • The distance between the sun and the Northern and
    Southern Hemispheres of Earth are equal!

16
Seasons Animations
  • http//www1.teachertube.com/viewVideo.php?titleWh
    at_Causes_Seasons_on_Earthvideo_id657
  • http//esminfo.prenhall.com/science/geoanimations/
    animations/01_EarthSun_E2.html
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