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Hayanaratna · by Balabhadra
Chapter 1 · Planets, Signs, Year Entry
ग्रहराशिस्वरूपवर्षप्रवेशाद्यानयनाधिकारः
तद्यथा ॥ यदि सूर्यस्पष्टगतिकलाभिः षष्टिघटिकास्तदार्कांतरकलाभिः किमिति लब्धभाज्याद्येन वर्षावेशकालः संस्कार्य इति तस्मात्तत्करणजतद्देशांतरभुजांतरसंस्कृतोभीष्टायनांशवशादुत्पन्नोदयांतरेण तद्देशजपलभोत्थतात्कालिकचरेणच संस्कृतो वर्षार्कौ जन्मार्कसमो यदि न स्यात्तदैव कालस्पष्टत्वमन्यथा नेति सिद्धांतः ॥
It goes like this. The minutes of the Sun's true daily motion give sixty ghatikas (24-minute unit). Then what do the minutes of the Sun's difference give? Correct the year-entry time by the result found. So take the year Sun corrected by that karana (short handbook for planet maths) for longitude and bhujantara (time correction for the Sun's uneven motion). Correct it also for the rising difference from the chosen ayanamsha (the zodiac shift). Correct it also for the chara (day-length difference) of that time, from that place's palabha (noon shadow at the equinox). If it then still does not equal the birth Sun, only then is the time corrected. Otherwise not. This is the settled view.
Simple meaning: The proportion: the Sun's daily motion gives 60 ghatikas, so the Sun gap gives the time to correct, only if the Suns still differ.
श्रीमन्नीलकंठदैवज्ञैस्तु स्वल्पांतरत्वान्नोक्तमतो न कोपि दोषः ॥
Nilakantha left this out: the difference is tiny, so it is no fault.
अथ वर्षप्रवेशे तिथ्यानयनमुक्तं पद्धतिभूषणे ॥
Tithi at the year entry: years gone times 11, plus a small part, plus the birth tithi, remainder by 30. It may be one off.
नक्षत्रयोगानयनमुक्तं ताजिकसारे ॥
Nakshatra and yoga at the year entry: years gone times 10, less a 240th part, plus the birth nakshatra or yoga, remainder by 27.