The Astronomical Observatories of Jai Singh c22.s1.t7: D (7). Precession of the Equinoxes
The Astronomical Observatories of Jai Singh c22.s1.t7
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D (7). Precession of the Equinoxes
c22.s1.t7.1
Annual precession.
c22.s1.t7.2
| A. D. | 150 Ptolemy. | . | . | 36" a year or 1° in 100 years. |
| | 810 al-Battānī | . | . | 54·55" a year or 1° in 66 years |
| | 1100 Sūrya Siddhānta | . | . | 54" a year. |
| | 1150 Bhāskara | . | . | 59·9" a year. |
| | 1370 Mahendra Sūri | . | . | 54" a year. |
| | 1500 Copernicus | . | . | 50·2" a year. |
| | 1590 Tycho Brahe | . | . | 51" |
| | 1729 Jai Singh | . | . | 51·6" or 4° 8' in 297 Muslim years. |
c22.s1.t7.3
[The precession for celestial longitude of all stars is approximately 50" 26" a year or, more correctly, 50·2564"+0·0222" T (where T is the time in centuries reckoned from A.D. 1900). The complete period of precession is approximately 25,696 years.]
Linked texts (2)
- Sūryasiddhānta — Maya, Sanskrit
- Bhagavantabhāskara — Nīlakaṇṭha Dīkṣita 1625, Sanskrit