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INDEX B5: ORBITAL MECHANICS

B5.01 PLANETARY MOTION

An orrery shows the relative motion of the Earth, Luna, and Mercury about the Sun.

B5.02 EARTH - MOON SYSTEM

A large ball and a small ball at the ends of a rod represent the Earth and the Moon. When the rod is pivoted around its geometric center, the system is unstable, and friction quickly stops the rotation. When the rod is rotated around its center of mass, the system is stable and rotates freely.

B5.03 FOUCAULT PENDULUM

A model of a Foucault Pendulum for illustrating one of the proofs that the Earth is rotating.

B5.04 SOLAR SYSTEM MODEL

Tennis balls strung on a wire model the relative positions of the planets.

B5.05 LUNAR AND SOLAR ECLIPSES

A spotlight at the lecture bench serves as the sun. Students use a tennis ball to model the earth and a ping pong ball to model the moon. As the "moon" rotates around the "earth" its shadows illustrate eclipses.

B5.06 THE CELESTIAL SPHERE

The apparent positions of stars on the celestial sphere are mapped on a large plastic sphere.

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