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The Surya Siddhanta is one of the foundational texts of Indian astronomy, dating back to at least the early centuries of the Common Era, though its oral traditions may be older. It represents a sophisticated blend of observational astronomy, mathematical calculations, and cosmological philosophy, deeply rooted in the Indian epics, Puranas, and Siddhantic tradition. Unlike a purely mythological work, it frames celestial phenomena in precise mathematical terms, enabling predictions of planetary positions, eclipses, and the timing of rituals, thus connecting religious practice with empirical observation. The text’s astronomical framework influenced not only subsequent Indian astronomy but also laid foundations that echoed in later global scientific developments. The Surya Siddhanta treats the universe as a spherical system with the Earth at the center, revolving around a fixed cosmic framework. It introduces methods to calculate the motions of the Sun, Moon, planets, and stars using trigonometric principles, some of which were remarkably advanced for its time. For instance, it provides formulas for the mean and true motions of planets, methods to determine the lunar and solar eclipses, and a precise value for the length of the year. The text employs concepts such as the division of the circle into 360 degrees and subdividing each degree into minutes and seconds, demonstrating early use of angular measurement that would later become standard in global astronomy. Mathematically, the Surya Siddhanta contributed significantly through its systematic use of algebra, _____ _____ _______ ________ ______.
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