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Kepler’s Laws

Kepler’s Laws. 1. Planets have an elliptical orbit 2. Equal time sweeps out equal area 3. Time squared = distance cubed. Kepler’s Third Law. Time squared = distance cubed Time = years to revolve around the Sun Distance is from the Sun to the planet of interest (Astronomical Units – AU)

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Kepler’s Laws

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  1. Kepler’s Laws • 1. Planets have an elliptical orbit • 2. Equal time sweeps out equal area • 3. Time squared = distance cubed

  2. Kepler’s Third Law • Time squared = distance cubed • Time = years to revolve around the Sun • Distance is from the Sun to the planet of interest (Astronomical Units – AU) • Example: • Next Slide Please

  3. Kepler’s 3rd Law • Example: • Jupiter takes ~12 years to revolve one time around the Sun • 12 squared = 144 (Time squared) • Dist^3 = 144 • Cube root of both sides • Distance from the Sun = cube root of 144 or • 5.2 Astronomical Units (AU)

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