The Analemma

In everyday language, an analemma is the base of a sundial but in astronomical terms it means the angular offset of an astronomical body from its mean position.

When astronomers refer to the analemma, they are normally referring to that of the Sun.

If you take a picture of the Sun at the same time each week, from exactly the same position, on a single frame of film, the figure of eight shape that results is called the analemma. It takes patience and dedication to take a photograph of the analemma.

Wikipedia article

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