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Kepler's
1st Law: Ellipses
-
To
draw an ellipse, tie a loop of string loosely between two tacks
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Tacks
are at the foci
(plural of focus)
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Major
axis is long dimension
-
Minor
axis is short dimension
-
Semimajor
axis is half of the major axes, this is the
average
distance between the planet and the Sun
-
e
is eccentricity
-
Aphelion
analogous to apogee (farthest out)
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Perihelion
analogous to perigee (closest in)
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