jueves, 1 de septiembre de 2016

Portable sundial: UC 16376

Portable sundial: UC 16376
This fragment of a sundial is one of the few surviving examples of a portable clock. Two features important for a sundial raise problems for a portable version: a sundial must be oriented in a certain way (normally East-West) and the sundial must be placed absolutely horizontal on its ground. The latter could be arranged, by hanging a plumb froma line attached to the clock. For the orientation it was more difficult to find a solution
http://www.ucl.ac.uk/museums-static/digitalegypt//astro/uc16376.html

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