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Hayanaratna · by Balabhadra
Chapter 8 · Month Chart and Monthly Results
मासप्रवेशादिविचाराध्यायः
खरामभागेन युतश्चरार्द्धश्चरार्द्धतुल्या विकला रवेस्तु ॥चरान्तरं स्यादुदये तुलाजषड्भे धनर्णं विपरीतमस्ति ॥ ५ ॥
... joined with the thirtieth part (kha-rama 30), it is the charardha (half the day-length difference). Seconds equal to the charardha are the Sun's charantara (day-length correction). At sunrise it is plus when the sayana Sun is in the six signs from Libra. It is minus in the six from Aries. The reverse also holds.
Simple meaning: 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, minus in the Aries half.
त्रयाणां वीर्य्यमार्गेण योगस्त्रैक्य उदाहृतः ॥
The traikya is the total of the three corrections; an easy method follows.
सायनस्फुटसूर्य्यस्य भुक्तांशास्स्वोदयैर्हताः ॥
Easy traikya: the Sun's gone degrees times the rising time of its sign, divided by 30, plus the rising times of the signs from Aries before it.
षष्टिभक्तन्नाडिकादि अथ मध्यमभास्करः ॥
Easy traikya: divide by 60 for ghatikas. For the mean Sun, the sixth part of its tropical degrees gives ghatikas.