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→Orbit eccentricity
=='''Orbit eccentricity'''==
=='''Orbit eccentricity'''==
[[Image:Gravitation%20for%20wiki_html_m75870f64.gif300px|left]] <br>The semi major axis of the ellipse is a and represents the planet's average distance from the Sun. The eccentricity, “e” is defined so that “ea” is the distance from the centre to either focus. A circle is a special case of an ellipse where the two foci coincide. The Earth and most of the other planets have nearly circular orbits. For Earth, “e” = 0.017.<br><br><br>
[[Image:Gravitation%20for%20wiki_html_m75870f64.gif|300px|left]] <br>The semi major axis of the ellipse is a and represents the planet's average distance from the Sun. The eccentricity, “e” is defined so that “ea” is the distance from the centre to either focus. A circle is a special case of an ellipse where the two foci coincide. The Earth and most of the other planets have nearly circular orbits. For Earth, “e” = 0.017.<br><br><br>
= The Law of Equal Areas =
= The Law of Equal Areas =