an exercise in miscellany

Perihelion

In science & nature, words & phrases on August 17, 2013 at 2:22 pm

perihelionAll planets, comets and asteroids in our solar system have approximately elliptical (a kind of non-circular) orbits (any single revolution of a body around the sun is only approximately elliptical, because the phenomenon known as precession of the perihelion prevents the orbit from being a simple closed curve such as an ellipse). Thus, they all have a closest and a farthest point from the sun: a perihelion and an aphelion.

via Perihelion

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