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Hayanaratna · by Balabhadra
Chapter 8 · Month Chart and Monthly Results
मासप्रवेशादिविचाराध्यायः
ततस्स्वाभीष्टसूर्य्यस्य मासार्केनांतरं चरेत् ॥कालाद्यं स्पष्टगत्याप्तं स्याद्दिनादि फलं स्फुटम् ॥ १७ ॥
Then one should take the difference between the chosen Sun and the month Sun. Its minutes and so on, divided by the true motion, give the result in days and so on, exact.
Simple meaning: 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.
वर्तमानो वासरश्च सूक्ष्मं स्यान्मासवेशनम् ॥
This gives the current weekday and the month entry. Another method is taught, from the teachers' words.