Astrophysics Dec 2012. Since the Earth's mean solar day is almost exactly 24 hours, an analemma can...
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Astrophysics Dec 2012. Since the Earth's mean solar day is almost exactly 24 hours, an analemma can be traced by plotting the position of the Sun as viewed
Since the Earth's mean solar day is almost exactly 24 hours, an
analemma can be traced by plotting the position of the Sun as
viewed from a fixed position on Earth at the same clock time every
day for an entire year. The resulting curve resembles a lemniscate
of Bernoulli. This curve is commonly printed on globes, usually in
the eastern Pacific Ocean, the only large tropical region with very
little land. It is possible, though challenging, to photograph the
analemma, by leaving the camera in a fixed position for an entire
year and snapping images on 24-hour intervals (or some multiple
thereof), see section below. Reference:
http://en.wikipedia.org/wiki/Analemmahttp://en.wikipedia.org/wiki/Analemma