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

246 Thus Sama-Śaṅku or S.S. = (H sin δ × R) / (H sin φ) or (R sin δ) / (sin φ) (17). Taddhṛti = R × (H sin δ) / (H sin φ) × R / (H cos φ) = (R sin δ) / (sin φ cos φ) (18). Verse 21. Taddhṛti = (Karṇa × Agrajyā) / Bhuja Comm. This pertains to the similarity between the fourth latitudinal triangle and the others. Latter half of Verse 21 and first half of Verse 22. Sama-Śaṅku = (Taddhṛti × Koṭi) / Karṇa = (Agrajyā × Koṭi) / Bhuja (Sama-Śaṅku × Bhuja) / Koṭi = Agrajyā. Comm. The first statement is made out of the similarity between the fourth lat. triangle and the others whereas the second statement and the third as well are made out of the similarity between the third and others. II half of Verse 22. Sama - Śaṅku = Upper segment of Taddhṛti × Karṇa / Koṭi Comm. The similarity is between the fifth triangle and others. Verse 23. Kujyā = Krāntijyā × Bhuja/Koṭi Upper segment of Taddhṛti = (Krāntijyā × Koṭi) / Bhuja and Kujyā + Upper segment of Taddhṛti. Comm. The first statement is through the similarity of the third triangle with others, whereas the second is through the similarity of the fifth with the others. The third statement is clear from Fig. 21.