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What is an analemma?

What is an analemma? Here are some definitions.

Noun
  1. An egg-shaped or figure-eight curve that results when the Sun's position in the sky is plotted out over the year at the same hour of mean solar time every day.
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Examples
It's that uneven figure 8 that can be found on globes in a deserted part of the Pacific, a shape known as an analemma.
If he had taken the photographs at an earlier time in the day, the analemma would have been tilted to the left.
An analemma is the figure-eight pattern formed by plotting the position of the sun in the sky every day at the same time for a year.
The analemma also records the difference between local solar time and local mean time for each day of the year.
As the length of daylight is influenced by the position of the sun and the axis of the earth, this is easily seen on the Geochron analemma.
The height of the analemma is due to the tilt of the Earth, and its width is due to both the tilt and the elliptical nature of Earth's orbit.

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