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Mādhava’s Rule for Finding Angle Between the Ecliptic and the Horizon and Āryabhata’s Knowledge of it
Published online by Cambridge University Press: 12 April 2016
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In Fig.1, let U be the rising point of the ecliptic (udayalagna), T be the nonagesimal (tribhona-lagna) and M be the meridianecliptic point (madhya-lagna). Since T is at a distance of one quadrant from U along the ecliptic, the complement of the zenith distance of, that is the arc TK, will be the required angle between the ecliptic UTM and the horizon NUEKS. The equivalent problem in Indian astronomy is therefore to find what is called ‘dṛkkṣepa-jyā’ or the sine of the zenith distance of the nonagesimal.
- Type
- Mediaeval Astronomy
- Information
- International Astronomical Union Colloquium , Volume 91: History of Oriental Astronomy , 1987 , pp. 197 - 202
- Copyright
- Copyright © Cambridge University Press 1987
References
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