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Motion. Astronomy. The study of objects in space, including the moon, stars, and planets. Solar system Composed of the sun and the planets which travel around the sun. Galaxy A large group of stars (and solar systems) in space. PREVIEW OF TODAYS LESSON!!.

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astronomy
Astronomy
  • The study of objects in space, including the moon, stars, and planets.
  • Solar system
    • Composed of the sun and the planets which travel around the sun.
  • Galaxy
    • A large group of stars (and solar systems) in space.
preview of todays lesson
PREVIEW OF TODAYS LESSON!!
  • http://www.youtube.com/watch?v=WLRA87TKXLM
earth s movements
Earth’s Movements
  • Earth spins like a top on an imaginary line called its Axis.
    • Earth’s axis is tilted 23.5 degrees.
  • The spinning of Earth is called rotation.
  • Rotation causes day and night.
    • It takes Earth 24 hours to complete one rotation.
slide6

Earth also travels around the sun in an elliptical, or oval orbit.

  • This is called a revolution.
    • The movement of one object around another.
  • The path the Earth follows is called its orbit.
  • One revolution of Earth around the sun is 365.25 days.
seasons
Seasons
  • The more direct sunlight an area of Earth experiences, the warmer it will be.
slide9

Due to the tilt of her axis, different areas of Earth get direct sunlight at different times.

  • When the Northern Hemisphere is tilted towards the sun, it receives more direct sunlight.
    • Summer in the north, winter in the south.
  • When the southern Hemisphere is tilted towards the sun, it receives more direct sunlight.
    • Summer in the south, winter in the north.
slide10

Summer solstice

    • When the sun’s light reaches its farthest distance North of the equator.
    • June 21st
slide12

Winter Solstice

    • When the sun’s light reaches its farthest point south of the equator.
    • December 21st
slide14

Spring and Fall Equinoxes

    • Occurs when neither hemisphere is pointed directly at the sun (in-between the winter and summer solstices).
    • Vernal Equinox-March 21st.
    • Autumnal Equinox-September 22nd.