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Ellipsi

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1.1   Oval, quadratic closed curve.

1.2   An ellipse is the intersection of a cone with an inclined plane

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1.3              Ellipse area                  

                   A = π  x a x b

                   a and b are minor and major axis

1.4   The orbit of each planet in the solar system is an ellipse

In the time, the Sun, Moon and planets were assumed to have a perfect circular orbits. Johannes Kepler (1571 - 1630) rejected the idea of circular planetary orbits, and ended up the idea of their elliptical paths, as known nowadays

1.5   Five possible cross-section of the cone which is known for thousands of years.

- point - circle - ellipse - hyperbola - parabola

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1.6  The sum of distances from two poinst is equal to major axis.

        Points are two foci of the ellipse

 

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15.5.2015*09:00 (1103 - 1102)
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