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I thought the orbit of the earth was a simple ellipse... Turns out there is quite a lot more going on.
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Definitions:
Perihelion: the point in the orbit of a planet or comet where it is nearest to the sun. (from Greek "peri" ("near") and "helios" ("sun")
Aphelion: the point in the orbit of a planet or comet where it is farthest from the Sun.
Analemma: a scale shaped like the figure 8, showing the declination of the sun and the equation of time for each day of the year. (from Latin "sundial")
Eccentricity: A measure of the deviation of an elliptical path from a perfect circle
Sidereal: of or pertaining to the stars (from Latin: sidus star, constellation)
Aphelion: the point in the orbit of a planet or comet where it is farthest from the Sun.
Analemma: a scale shaped like the figure 8, showing the declination of the sun and the equation of time for each day of the year. (from Latin "sundial")
Eccentricity: A measure of the deviation of an elliptical path from a perfect circle
Sidereal: of or pertaining to the stars (from Latin: sidus star, constellation)
