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Geometric Model by A. Harry Wheeler, Spherical Angle and Its Measure
From the collection of National Museum of American History. Free to download, adapt and use — no permission needed.
About this work
The angle between two great circles on a sphere is defined to be equal to the angle between the lines tangent to the circles at their point of intersection. This cut and folded tan paper model of a sphere shows two intersecting great circles and tangents to them. It is among the models Wheeler dubbed collapsible.
National Museum of American History’s own descriptionCredit lineGeometric Model by A. Harry Wheeler, Spherical Angle and Its Measure. 1916. Wheeler, Albert Harry. National Museum of American History, Gift of Helen M. Wheeler. CC0.
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