Hayanaratna · by Balabhadra
Chapter 1 · Planets, Signs, Year Entry
ग्रहराशिस्वरूपवर्षप्रवेशाद्यानयनाधिकारः
अथ वर्षप्रवेशे तिथ्यानयनमुक्तं पद्धतिभूषणे ॥समासमाजः शितिकण्ठ ११ निघ्नः समष्टि २६ भागेन समन्वितोस्यै ॥स्वजन्मतिथ्या च खराम ३० तष्टस्तिथिर्भवेद्भू १ नयुता कदाचिदिति ॥
Next, finding the tithi (moon day) at the year's entry, told in the Paddhatibhushana. Multiply the years gone by 11. Add a 26th part of the years gone to it. Add one's own birth tithi too. Cast out thirties. The remainder is the tithi. Sometimes it is one less or one more.
Simple meaning: 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.
लग्नानयनमुक्तं पद्धतौ ॥
Lagna at the year entry, roughly: years gone times 3.1, plus the birth lagna, remainder by 12.
अत्र तिथिनक्षत्रयोगोवर्षप्रवेशदिवसस्य प्रायो नैकत्वेनायाति ॥
A warning: the tithi, nakshatra and yoga found this way are often not those of the entry day.