Abstract
In the era of computers and sophisticated technology many basic principles and concepts inherited from antiquity are sometimes forgotten. In this paper the history of a stick vertically placed in the ground, a gnomon, a shade tool for predicting time, as well as an instrument for measuring solar coordinates on a fictitious sky dome is examined. The practical needs of determining sunpaths stimulated the orthographic projections and descriptive geometry principles in traditional analemma rules, later interpreted in mathematical formulae.
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