THE EARTH, THE MOON & THE SUN

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Presentation transcript:

THE EARTH, THE MOON & THE SUN

Rotation: Spinning on an axis (Sun, Earth, Moon). Revolution: A complete trip around an object (Earth, Moon).

Orbits Aphelion: Earth is farthest from the sun. Perihelion: Earth is closest to the sun. Perigee: Moon is closest to Earth. Apogee: Moon is farthest from Earth.

Kepler’s Laws of Planetary Motion 1st Law: The orbit of a planet is an ellipse with the Sun at one of the two foci. A planets orbit is an ellipse, not a circle. 2nd Law: A line segment joining a planet and the sun sweeps out equal areas during equal intervals of time. The Sun is not at the center but at a focal point of the elliptical orbit. 3rd Law: The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit. Linear and angular speed of a planet is not constant, but the area speed is constant.

1st Law: A planets orbit is more of an oval than circle. 2nd Law: The Sun is off to the side inside the oval. 3rd Law: Planets move in the oval faster if closer to the sun.