consequences of the laws of Kepler.
According to 1 st Law, as the planets orbit the Sun ellipses and meet in one focus, distance the planet from the Sun varies, with the minimum distance when the planet is at perihelion and the maximum distance when the planet and is in line afelio.La ranging from perihelion to aphelion is called the apsidal line.
ellipses of the planets have low eccentricity (maximum 0.247 for Pluto), ie, their orbits are almost circulares.Los planets orbits travel in the forward direction (counter-clockwise to an observer in the northern hemisphere).
According to the 2 nd Law, the speed of the planet is not uniform, being greater at perihelion than at aphelion, as the distance from the Sun in the first minor in the second. Ie, "that in time equal, the ellipse arcs are traversed by a planet, the greater the closer the planet is the sun. "This difference in speed, and later was shown by Newton, is due to the attraction of the mass of the Sun exerts on the mass the planet, which being the planet next to the sun increases the attractiveness and its speed is greater.
According to the 3 rd Law, it follows that the average speed with which roam the orbits of the planets is much smaller, the farther apart the Sun's planets
Kepler's three laws, also marks the orbits of satellites around their planets.
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