Abstract
The true position of the Earth’s shadow is said to be the sum of the true position of the Sun and a half-circle (180 degrees). Having determined the position of the Moon and the [Earth’s] shadow either at sunrise or at sunset, whichever is closer [to the conjunction], the time of their conjunction may be determined. If [the longitude of] the Moon is greater then the conjunction is over, and if it is less then it is yet to occur. Their difference [in longitude] multiplied by 60 and divided by their difference in daily motion [gives] the time for conjunction (the yogakāla) expressed in ghatīs etc. that has already elapsed or is yet to elapse respectively.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Bibliography
Tantrasa˙ngraha of Nīlakaṇṭha Somayājī, ed. with Laghuvivṙti by S. K. Pillai, Trivandrum 1958.
Tantrasa˙ngraha of Nīlakaṇṭha Somayājī, ed. with Yukti-dīpikā (for chapters I–IV) and Laghu-vivṙti (for chapters V–VIII) of Śaṅkara Vāriyar by K. V. Sarma, Hoshiarpur 1977.
S. Balachandra Rao, Indian Mathematics and Astronomy: Some Landmarks, Bangalore 1998 (3rd edn 2004).
E. Burgess, The Sˆuryasiddhˆanta: A Text-Book of Hindu Astronomy, American Oriental Society, New Haven 1860 (repr.Motilal Banarsidass, Delhi 1989, 1997, 2000).
James Evans, The History and Practice of Ancient Astronomy, Oxford University Press, New York 1998.
K. V. Sarma, A History of the Kerala School of Hindu Astronomy, Hoshiarpur 1972.
H. Selin, (ed.) Astronomy Across Cultures: The History of Non-Western Astronomy, Kluwer, Dordrecht 2000.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
Copyright information
© 2011 Hindustan Book Agency
About this chapter
Cite this chapter
Ramasubramanian, K., Sriram, M. (2011). Lunar eclipse. In: Tantrasaṅgraha of Nīlakaṇṭha Somayājī. Sources and Studies in the History of Mathematics and Physical Sciences. Springer, London. https://doi.org/10.1007/978-0-85729-036-6_4
Download citation
DOI: https://doi.org/10.1007/978-0-85729-036-6_4
Publisher Name: Springer, London
Print ISBN: 978-0-85729-035-9
Online ISBN: 978-0-85729-036-6
eBook Packages: Mathematics and StatisticsMathematics and Statistics (R0)