"Having fixed a pole, on a level piece of ground, and having described a circle by a cord attached to the pole, one should mark the points with pegs, where the shadow of the top of the pole touches the circle. The line joining these pegs is the West to East line. Having increased the length of the cord (which is equal to the distance of the two pegs fixed in the East West line) by itself, one should provide two slings at each end of the cord. Fix the slings on the two pegs (already fixed) stretch the cord with its mid point towards the south and fix a peg at the place, where the mid point of the cord touches the ground. He should similarly proceed towards the North. The line joining these pegs will be the South to North line."
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Original Language: English
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Sources
Ohashi, Yukio. ‘Development of Astronomical Observation in Vedic and Post- Vedic India’. Indian Journal of History of Science, 28(3), 1992.
https://en.wikiquote.org/wiki/Gnomon
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Gnomon
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