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Hayanaratna · by Balabhadra
Chapter 8 · Month Chart and Monthly Results
मासप्रवेशादिविचाराध्यायः
जन्मार्को मध्यमोभीष्टमासपार्श्वे भवेद्रविः ॥निरेका माससंख्या च खराम ३० गुणितायुता ॥ १५ ॥
The birth Sun, the mean Sun, becomes the Sun near the chosen month. The month number less one, multiplied by thirty (kha-rama 30), is joined.
Simple meaning: The mean Sun near the chosen month is found from the birth Sun. The month number less one, times 30, is added.
स्वजन्माहर्गणेभीष्टार्कसंबंधी भवेद्गणः ॥
For the chosen month, work out the true Sun as told, with its motion and the traikya.
ततस्स्वाभीष्टसूर्य्यस्य मासार्केनांतरं चरेत् ॥
Take the gap between the chosen Sun and the month Sun and divide it by the true motion. That gives days.
स्वाभीष्टसूर्ये मासार्कादधिके तदृणं स्मृतम् ॥
If the chosen Sun is more, take the days away; if less, add them. This corrects the year lord's weekday.