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Hayanaratna · by Balabhadra
Chapter 8 · Month Chart and Monthly Results
मासप्रवेशादिविचाराध्यायः
यदायनांशाढ्यरविर्मुखे स्याद्घटस्य मेषस्य च तत्र शंकोः ॥सूर्य्याङ्गुलस्यद्युदलेप्रमाक्षप्रभास्थिता दिग्गज ८ दिग्वि १० निघ्नी ॥
The Sun, with the ayanamsha (the zodiac shift) added, may be at the start of Libra or of Aries. Then take the gnomon of 12 (surya) finger-widths. Its shadow at one's own midday is the akshaprabha (noon shadow at the equinox). Set it down and multiply it by ten, eight and ten (dig, gaja, dig).
Simple meaning: Steps of the day-length change: the noon shadow of a 12-finger stick at the equinox is multiplied by 10, 8 and 10.
कष्ट | १ | २ | ३ | ४ | ५ | ६ | ७ | ८ | ९ | १० | ११ | १२ | १३ | १४ | १५ | १६ | १७ | १८ | १९ | २० | २१ | २२ | २३ | २४ | २५ | २६ | २७ | २८ | २९ | ३०
Table for the Sun: manda equation, cell difference and motion result for 1 to 90 degrees of the manda anomaly, in three blocks of 30.
अंत्यास्त्रिहृत्स्युश्चरखण्डकानि क्रमेण सूर्योदयनांशयुक्तात् ॥
Steps of the day-length change: the third product is divided by 3. Then add the gone steps for the arc's signs, and the remainder times the next step.
खरामभागेन युतश्चरार्द्धश्चरार्द्धतुल्या विकला रवेस्तु ॥
Day-length correction: the sum found is the half day-length difference. The same number in seconds is the Sun's correction, plus in the Libra half…