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Sarma, Sreeramula, Bagheri, Mohammad. (1389). Shabnumā-wa-Rūznumā A Rare Astronomical Instrument Extant in Two Specimens. , 8(1), 21-48.
Sreeramula Sarma; Mohammad Bagheri. "Shabnumā-wa-Rūznumā A Rare Astronomical Instrument Extant in Two Specimens". , 8, 1, 1389, 21-48.
Sarma, Sreeramula, Bagheri, Mohammad. (1389). 'Shabnumā-wa-Rūznumā A Rare Astronomical Instrument Extant in Two Specimens', , 8(1), pp. 21-48.
Sarma, Sreeramula, Bagheri, Mohammad. Shabnumā-wa-Rūznumā A Rare Astronomical Instrument Extant in Two Specimens. , 1389; 8(1): 21-48.

Shabnumā-wa-Rūznumā A Rare Astronomical Instrument Extant in Two Specimens

تاریخ علم
مقاله 7، دوره 8، شماره 1، شهریور 1389، صفحه 21-48    اصل مقاله (739.66 K)
نویسندگان
Sreeramula Sarma1؛ Mohammad Bagheri2
1Formerly Professor of Sanskrit, Aligarh Muslim University, India
2Institute for the History of Science, University of Tehran, Iran
چکیده
In India, there are extant two nineteenth century specimens of an otherwise unknown astronomical instrument called Shabnum?-wa-R?znum? with which observations can be done both in the day and at night. While the R?znum? is nothing but a sine/horary quadrant, the Shabnum? appears to be inspired by the Sanskrit instrument Dhruvabhrama-yantra which was invented by Padman?bha in the first quarter of the fifteenth century in Central India. After a brief description of the Dhruvabhrama-yantra, the two specimens of the Shabnum?-wa-R?znum? are described in detail.
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