Conceptual Question 1 (Ohio Northern):
Keplers Laws tell us that the planets move around the Sun in elliptical orbits with the sun at one focus and that the radius vector of the orbit sweeps out equal areas in equal time intervals. If perihelion is defined as the closest point in the orbit of a planet to the Sun and aphelion is defined as the most distant point in the orbit from the Sun; during what northern hemisphere season is the earth at perihelion?
e. Changes from year to year
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