Duration of Daylight

See the duration of daylight, graphed per-day for the current year, at a given location in the United States by specifying the state and city below.
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The earth's motion about the sun is not nearly so tidy as a simple ellipse. The movement is actually quite crazy and takes sustained study (or a really good teacher) to fully grasp.
  1. Read about the Equation of Time at the U.S. Naval Observatory
  2. Youtube video showing the motion of the Earth about the Sun