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Earth in Space

Earth in Space. Chapter 1, Section 1. How Earth Moves. Earth moves in two ways: Rotation Revolution. Rotation. Spinning on its axis Takes 24 hours (day). Revolution. To move around another object Earth “orbits” around the sun Takes 365 ¼ days (year); Ellipse shaped.

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Earth in Space

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  1. Earth in Space Chapter 1, Section 1

  2. How Earth Moves • Earth moves in two ways: • Rotation • Revolution

  3. Rotation • Spinning on its axis • Takes 24 hours (day)

  4. Revolution • To move around another object • Earth “orbits” around the sun • Takes 365 ¼ days (year); • Ellipse shaped

  5. What causes day and night • Caused by the rotation of Earth • It is day on the side of the Earth facing the sun • It is night on the side facing away from the sun • Earth rotates eastwards causing the sun to appears to rise in the east and set in the west • Takes 24 hours for a complete day/night cycle

  6. Seasons • Occur because Earth’s axis is tilted at a 23.5° angle as it revolves around the sun • Not caused by the Earth’s distance from the sun

  7. Solstices • June solstice (June 21st) • North end of Earth’s axis is tilted towards the sun • Summer in the Northern Hemisphere • More hours of daylight • December solstice (December 21st) • South end of Earth’s axis is tilted towards the sun • Winter in the Northern Hemisphere • Fewer hours of daylight

  8. Equinoxes • Means “equal night” • Day and night are both 12 hours long • Neither end of Earth’s axis is tilted toward the sun • March 21st= vernal (spring) equinox • September 22nd= autumnal (fall) equinox

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