Round and Round

"What goes up... Stays up?"

The difficult takes time, the impossible can happen overnight.

Author Unknown

The image you are looking at shows the 18 GPS satellites plus three spares the United States keeps in various orbits around the Earth. GPS, the indispensable modern navigation tool, stands for Global Positioning System.

In the next three lessons, you will learn what keeps this complicated system working.

Homework Quiz

Introduction to Orbital Mechanics

Lesson Objectives:

GPS System

Geostationary Satellites

Centripetal Force

Universal Gravitation

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