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The Earth and Sun

The Earth and Sun. Shedding Some Light on the System. Earth’s Rotation…. Earth’s rotation on its axis generates periods of daylight and night. http://www.onr.navy.mil/focus/spacesciences/observingsky/motion1.htm. Earth’s Rotation….

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The Earth and Sun

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  1. The Earth and Sun Shedding Some Light on the System PGCC PSC 121 Gage

  2. Earth’s Rotation… • Earth’s rotation on its axis generates periods of daylight and night. http://www.onr.navy.mil/focus/spacesciences/observingsky/motion1.htm PGCC PSC 121 Gage

  3. Earth’s Rotation… • The amount of daylight/nighttime is also determined by the amount of Earth’s tilt. The Earth’s axis is tilted 23.5o from the plane of the Earth’s orbit around the Sun. PGCC PSC 121 Gage

  4. Earth’s Rotation… • The amount of daylight/nighttime is also determined by the amount of Earth’s tilt. The Earth’s axis is tilted 23.5o from the plane of the Earth’s orbit around the Sun. http://janus.astro.umd.edu/astro/seasons/ PGCC PSC 121 Gage

  5. Earth’s Revolution… The motion of the Earth in its orbit around the Sun is an ellipse, not a circle. That means that at some points in the orbit the Earth is closer to the Sun than at others. Circle Ellipse PGCC PSC 121 Gage

  6. Earth’s Revolution… When the Earth is closest it is at perihelion. When it is farthest, it is at aphelion. The difference in distance is about 3.5%...not enough to account for the seasonal changes! PGCC PSC 121 Gage

  7. Earth’s Revolution… So what causes the daily and seasonal changes? Earth’s curvature And its tilt ! PGCC PSC 121 Gage

  8. Earth’s Revolution… PGCC PSC 121 Gage

  9. Earth’s Revolution… PGCC PSC 121 Gage

  10. Earth’s revolution PGCC PSC 121 Gage

  11. Earth’s Revolution Since Earth’s tilt always points in the same direction, at a given point on the Earth the rays change in directness and duration. http://www.cs.sbcc.cc.ca.us/~physics/flash/ LengthofDay.swf PGCC PSC 121 Gage

  12. Earth’s Revolution Since Earth’s tilt always points in the same direction, points on the Earth will experience seasonal changes. http://www.astro.uiuc.edu/projects/data/Seasons/seasons.html PGCC PSC 121 Gage

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