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Hayanaratna · by Balabhadra
Chapter 8 · Month Chart and Monthly Results
मासप्रवेशादिविचाराध्यायः
त्रिभादल्पं भुजः केंद्रं रसेषूनं त्रिभाधिकम्॥षड्भाधिकं षडूनं स्याच्चक्राच्छोध्यन्नवाधिकम्॥
If the mandakendra (the Sun's distance from its high point) is less than three signs, it is the arc. If more than three signs, it is taken from six (rasa). If more than six signs, it is less six. If more than nine, it is taken from the circle.
Simple meaning: Finding the arc from the manda anomaly: under 3 signs it is the arc; over 3, take it from 6; over 6, take away 6; over 9, take it from the full circle.
भुजांशमिति कोष्ठस्थम्फलमंशादिकं रवेः॥
Manda equation from the table: take the cell for the arc's whole degrees, then add the remainder times the cell difference divided by 60.
स्पष्टं मंदफलं केंद्रे तुलाजाद्ये ऋणन्धनम्॥
True manda result: minus in the Libra half, plus in the Aries half. Applied to the mean Sun it gives the true Sun.
स्वर्णं कर्कमृगे केन्द्रे मध्यभुक्तौ स्फुटा गतिः ॥
True daily motion: add the cell result in the Cancer half, take it away in the Capricorn half. Then the true Sun at the year lord's time has its…