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Hayanaratna · by Balabhadra
Chapter 8 · Month Chart and Monthly Results
मासप्रवेशादिविचाराध्यायः
स्वजन्माहर्गणेभीष्टार्कसंबंधी भवेद्गणः ॥गतित्रैक्ययुताऽर्कस्य कर्तव्या स्फुटतोक्तवत् ॥ १६ ॥
In one's own birth day count, the group belonging to the chosen Sun comes about. Its exactness is made as told, joined with the motion and the traikya (the sum of three corrections).
Simple meaning: 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.
मासवेशे स्फुटा नाड्यस्तद्वारार्थमहर्गणः ॥
At the month entry, find the exact ghatikas. For the weekday, cut the day count by seven and use the corrected year lord's weekday.