Equatorial sundial

Equatorial sundial

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Credit: SEBASTIEN BEAUCOURT/LOOK AT SCIENCES/SCIENCE PHOTO LIBRARY

Caption: Equatorial sundial. On equatorial sundials, the planar surface that receives the shadow is exactly perpendicular to the gnomon's style (central bar). This plane is called equatorial, because it is parallel to the equator of the Earth and of the celestial sphere.

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Keywords: close-up, detail, equatorial sundial, gnomon, gnomonics, ground, meadow, sun dial, sundial, technological, technology, time keeping, time-keeping, timekeeping

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