Earth

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• Earths revolution
• Motion of the Earth

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The Effects
Season
Change in constellation
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characteristics

• Takes 1 year to orbit around the sun 365.24 days
  
• 1 degree/day
• Direction couterclockwise
• Distance - 150million km away

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Kepler
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Keplers first law

• http//www.classzone.com/books/earth_science/terc/
  content/visualizations/es0408/es0408page01.cfm?cha
  pter_novisualization
• http//www.abdn.ac.uk/physics/ntnujava/Kepler/Kepl
  er.html
• 1) All planets travel in elliptical orbits with
  the sun at one focus.

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Elliptical orbit
Aphelion - point farthest away from the
sun Perihelion point closest to the sun
Earth
Earth
SUN
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Keplers second law

• http//www.edumedia.fr/a243_l2-kepler-law.html
• Each planet orbits around the sun in such a way
  that it sweeps equal areas in equal times.

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Keplers third law

• http//www.astro.utoronto.ca/zhu/ast210/kepler.ht
  ml
• The farther a planet is from the sun, the longer
  is its period of revolution.

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REVIEW

• When does the Earth orbit closer to sun?
• During January (winter time)
• Describe Keplers third law?
• Farther a planet is from the sun, the longer it
  takes for the planet to complete its revolution

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REVIEW

• Describe Keplers first law
• Planets revolves around the sun in elliptical
  orbit
• With sun at one focus

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Eccentricity

• The degree of the flattening or ovalness of an
  ellipse
• Eccentricity Distance btw two foci
• Distance btw major axis

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