Bhojarājā and Bhāskara: Precursors of Karaṇakutūhala algebraic approximation formulas in the Rājamṛgāṅka
Telling time by the length of gnomon shadows is a very ancient practice. Prior to the development of spherical cosmological models and accompanying trigonometric techniques in the last few centuries bce, such computations relied on non-trigonometric algorithms approximately relating shadow lengths to time and geographic location.
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