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Jantar Mantar
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Jantar Mantar
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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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Gnomon
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sundial
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Analemma
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Equation of time
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Vitruvius
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Ibn al-Shatir
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Tower of the Winds
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Samrat Yantra
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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…