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Analemma
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Concept
Analemma
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Articles about Analemma
Sundial
The sundial is the earliest timekeeping device, reading the time of day from the shadow that a gnomon casts in the sun's rays. Egyptian obelisks and portable shadow clocks led to the hemispherical dials and hemicycles of the Greeks, to Vitruvius' rules of dial…
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Vitruvius
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Vitruvius
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sundial
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Equation of time
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SundialThe sundial is the earliest timekeeping device, reading the time of day from the shadow that a gnomon casts in the sun's rays. Egyptian obelisks and portable shadow clocks led to the hemispherical dials and hemicycles of the Greeks, to Vitruvius' rules of dial…