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Ghatika Yantra – Time Measurement in Days of No Sunlight in Ancient India | Sanskriti - Hinduism and Indian Culture Website
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Hourglass, timeless symbol of time passing, ancient device for measuring duration, metaphorical concepts 26443416 Stock Photo at Vecteezy
How was the second 'invented'? How are clocks built to exactly measure a second and how were computers taught the concept of this time length? - Quora
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