Equation for eccentricity
Distance between Foci/length of major axis
Planets farthest point to the sun
Aphelion
Planets closest point to the sun
Perihelium
24 hours
Rotation
1 year
Revolution
Keplers first law
Planets orbits are ellipses
“All planets move in elliptical orbits, with the Sun at one focus.”
* A planet’s path around the Sun is not a perfect circle but an ellipse (an oval-shaped curve). * The Sun is located at one focus of this ellipse, not at the center. * This means a planet’s distance from the Sun changes as it moves in its orbit.
Keplers second law
Law of equal areas
* As a planet moves around the Sun, it travels faster when it’s closer to the Sun and slower when it’s farther away.
* This happens because the planet covers equal areas in equal time intervals, even though the shape of the orbit changes the distance.
Keplers 3rd law
Law of orbital periods T^2 infinity r^3: farther planets take longer to orbit
The sun rises in the
East
The sun sets in the
West