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Kepler's Second Law
An article about Astronomy & Deep Space
Refer to the Equations on page 1 and the Solar System Data on page 15 of the Earth Science Reference Tables
Law of Equal Areas - Opposite Segments are Equal in Area
(Not Drawn to Scale)
Planets do not move at a constant velocity. However, since Area #1 = Area #2, the planet will travel the same amount of area in equal periods of time. In order for this to occur, the planet must travel at different speeds throughout its orbit.
Perihelion occurs when the planet is closest to the Sun and the planet is going fastest (occurs in January).
Aphelion occurs when the planet is furthest from the Sun and the planet is going slowest (occurs July).
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