A Concise History of Science in India c4.2

c4.2

| | | *Page* |
| 1. | A Survey of Source Materials | |
| | 1.1. Map showing Early, Middle and Late Stone Age sites | 4 |
| | 1.2. Map showing principal pre-Harappan settlements, and Harappan and post-Harappan sites . . . . | 7 |
| | 1.3. Map showing principal neolithic and chalcolithic sites . | 10 |
| 2. | Astronomy | |
| | 2.1. The celestial sphere and some important great circles . | 104 |
| | 2.2. Latitude, zenith distance and declination . . . | 105 |
| | 2.3. Declination, longitude and obliquity of the ecliptic . | 107 |
| | 2.4. Ascensional difference . . . . . . | 108 |
| | 2.5. Eccentric model . . . . . . . | 112 |
| | 2.6. Epicyclic model . . . . . . . | 113 |
| | 2.7. Eccentric-epicyclic model for finding the *śīghra* correction . . . . . . . . | 115 |
| | 2.8. Earth's shadow . . . . . . . | 119 |
| | 2.9. Conditions of eclipse . . . . . . | 120 |
| | 2.10. Duration of eclipse . . . . . . | 120 |
| | 2.11. Parallax . . . . . . . . | 121 |
| | 2.12. Latitudinal and longitudinal parallax . . . . | 122 |
| | 2.13. (*a*) Astrolabe. The 'face', *wadjih*, showing the graduated rim, the 'spider' and the circular tablets as seen through the 'spider' . . . | 127 |
| | 2.13. (*b*) Astrolabe. The 'spider' or *'ankabūt* . . . | 128 |
| | 2.13. (*c*) Astrolabe. The diopter or *al-'iḍāde* . . . | 128 |
| | 2.13. (*d*) Astrolabe. The 'back', *zahar* . . . . | 128 |
| | 2.14. *Samrāṭ yantra* . . . . . . . | 129 |