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Background information: Even though the word ellipse might seem uncommon to you, it really isn't. Ovals are ellipses. Circles are "perfect ellipses". The planets in our solar system orbit around the sun in ellipses, in very close to circular orbits. In this following project, you will learn about what makes an ellipse. At the very end is a slightly harder project of measuring your ellipse's eccentricity (how off-circular it is). The
planets in our solar system orbit around the sun in an ellipse. An ellipse
has two foci (plural fo
What you need: 1 sharp pencil or pen 2 pieces of tape 1 piece of cardboard (like from an empty cereal box) 1 piece of string or yarn -- at least 6" long
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r focus), the dots to the left. For a planet's
orbit, the sun must be at one of these focii, shown on the left by the yellow
dot. There is nothing at the other focus of the ellipse.