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Hayanaratna · by Balabhadra
Chapter 8 · Month Chart and Monthly Results
मासप्रवेशादिविचाराध्यायः
अथाहर्गणानयनम् ॥मेषसंक्रमदिनाद्गतमासास्त्रिंशता विनिहितादिनियुक्ताः ॥स्वाब्धितर्कलव ६४ वासरहीना जायते दिनगणोब्दपपूर्वः ॥२॥
Now, finding the day count. The months gone since the day of the Aries ingress are multiplied by thirty and joined with the days. Take away their own 64th part (sva-abdhi-tarka-lava, 64) in days. The day count comes out, counted from the year lord.
Simple meaning: Finding the day count: months since the Aries ingress times 30, plus days, less the 64th part. It is counted from the year lord.
अथ मध्यमार्कानयनम् ॥
Finding the mean Sun: divide the day count by 30 for months and days, take the Sun's motion for them, and add the starting value.
सूर्ये रुद्रा११भ२७कुबाण५१नवाग्नी३९क्षेपको मतः॥
Starting value of the mean Sun: 11 signs, 27 degrees, 51 minutes, 39 seconds.
रेखास्वदेशांतरयोजनानि निजांघ्रि९हीनानि विलिप्तिकास्स्युः ॥
Correction for east-west distance: yojanas from the line to your place, less a quarter, become seconds. Subtract for east, add for west.