सिद्धान्तशिरोमणि: गणिताध्याय (भास्कराचार्य - ग्रहगणित, मध्यमाधिकार व स्पष्टाधिकार सटीक)

194 ∴ log sin δ₂ = 9.6093 + 9.9375 = 9.5468 ∴ δ₂ = 20° – 30′ ∴ log sin EA₁ = 9.3634 + 9.5758 = 8.9392 ∴ EA₁ = 4° – 59′ = 299′ ∴ rE = 3463 – 299 = 3164 asus ∴ Rising time of Sāyana Vṛṣabha for the locality = 3164 – 1505 = 1659 asus. rA₂ = 5400, sin EA₂ = tan 13 tan δ₂ = tan 13 tan 24°. ∴ log sin EA₂ = 9.3634 + 9.6486 = 9.0120 ∴ EA₂ = 5° – 54′ = 354 asus ∴ rE = 5400 – 354 = 5046 ∴ Rising time of Mithuna is 5046 – 3164 = 1882 asus. Before we proceed to find the rising times of Karka- taka, Simha and Kanyā, we shall cast our previous proce- dure into the Hindu form. In fig. 21, let rS be the Sāyana Mesha. The rising time of rS is measured by rE, because when r is at E, Meṣa is just about to rise and when r is in the position indicated, the extremity of Meṣa namely S is rising. So it means that as rS of the ecliptic has risen, a portion rE of the Equator has risen. As time is measured by the arc of the equator which rises with a uniform speed, we measure the rising time of rS by the arc rE; but rE = rA – AE. rA is the Equatorial rising time of rS, because when A is at E, S will be at B i.e. A and S will then be on the equatorial horizon EB simul- taneously. Hence rA = 1670 as proved before and stated by Bhāskara. EA is the chara for 30°. The chara for one angula or inch (inch is here used technically, and does not mean what it means in ordinary parlour) as has been stated by Bhāskara and proved by us is 10 Vinadis. (Vide page 181)