Chapter Eight

ROMAKA-SIDDHĀNTA — SOLAR ECLIPSE ८. अष्टमोऽध्यायः रोमकसिद्धान्तः — रविग्रहणम्ः Introductory In this chapter the Sun, Moon and Rāhu according to the Romaka Siddhānta are given, as also the solar eclipse, dependent on these. But the lunar eclipse is not dealt with. We have already men- tioned that this Romaka is different from the Romaka extant now. [स्फुटरविः] रोमकसूर्यो द्युगुणात् 'खतिथि' (घ्नाः) 'पञ्चकर्तृ'परिहीणात् । 'सप्ताष्टकसप्तकृतेन्द्रियो'द्धृतानमध्यमः [क्रमशः] ॥ १ ॥ रविशशिनोः स्फुटकरणं स्वके (न्द्र) भवनार्धसंमितैः खण्डैः । (व्यु) त्क्रमशश्च पुनस्तैर्मिथुनद (लं) शोध्यतेऽर्कस्य ॥ २ ॥ 'तिथि-मनु-दश-कृत'सहिता 'रस-मनु'हीना (भिश्च) 'विंशति'र्हीना 'धृति-विषयो'ना 'द्वि-दशा-ष्टि-धृति'षु वृद्धिः कलाविकलाः ॥ ३ ॥ True Sun

1. According to the Romaka, the mean Sun in revolutions etc. is obtained by multiplying the Days from Epoch by 150, deducting 65 from the product, and dividing by 54,787.
2. Both the Sun and the Moon are to be made true by intervals of the equa- tion of the centre for half-signs of the respective mean anomalies given for the first three signs. For the next three signs they are to be taken in the reverse order. This is repeated for the next six signs. In the case of the Sun, the anomaly is got by deducting nā. 2-15-0 from the mean Sun.
3. The minutes of intervals for the Sun, are 20 + 15, 20 + 14, 20 + 10, 20 + 4, 20 − 6 and 20 − 14, from which seconds 18 and 5, are to be subtracted, and 2, 10, 16 and 18 are to be added, in the given order. Thus, (i) Mean Sun = (Days from epoch × 150 − 65) ÷ 54,787. (ii) The mean anomaly of Sun = Mean Sun − rāśi 2-15-0.