Orientation Gnomon

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gnomon situated on wall of building facing tiradentes square, curitiba, brazil



a gnomon in computer graphics


in northern hemisphere, shadow-casting edge of sundial gnomon oriented points north , parallel rotation axis of earth. is, inclined horizontal @ angle equals latitude of sundial s location. @ present, such gnomon should point precisely @ polaris, within degree of north celestial pole.


on sundials, gnomon vertical. these used in former times observing altitude of sun, when on meridian. style part of gnomon casts shadow. can change sun moves. example, upper west edge of gnomon might style in morning , upper east edge might style in afternoon. three-dimensional gnomon commonly used in cad , computer graphics aid positioning objects in virtual world. convention, x axis direction colored red, y axis green , z axis blue. nasa astronauts used gnomon photographic tool indicate local vertical , display color chart when working on moon s surface.







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