![]() Planet orbiting the Sun in an orbit with e=0. Planet orbiting the Sun in an orbit with e=0.2 Planet orbiting the Sun in an orbit with e=0.5 Planet orbiting the Sun in a circular orbit (e=0.0) A diameter would cut the orbit into equal parts, but the plane through the Sun parallel to the equator of the Earth cuts the orbit into two parts with areas in a 186 to 179 ratio, so the eccentricity of the orbit of the Earth is approximatelyĮ ≈ π 4 186 − 179 186 + 179 ≈ 0.015, Orbits of planets with varying eccentricities. The eccentricity of the orbit of the Earth makes the time from the March equinox to the September equinox, around 186 days, unequal to the time from the September equinox to the March equinox, around 179 days. Neither the linear speed nor the angular speed of the planet in the orbit is constant, but the area speed (closely linked historically with the concept of angular momentum) is constant. ![]()
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