Vertical South Dial

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In the common vertical dial, the shadow-receiving plane is aligned vertically; as usual, the gnomon’s style is aligned with the Earth’s axis of rotation. As in the horizontal dial, the line of shadow does not move uniformly on the face; the sundial is not equiangular.

Source

Encyclopaedia Britannica (11th ed., vol. 8) (New York, NY: The Encyclopaedia Britannica Company, 1910)

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