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Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Muhurta: Marriage, Home, Farming
ज्योतिःशास्त्रम्
रविकर्मविपरीता तिथिनाडीसमायुता ।ऋणे शुद्धे तु नाड्यः स्युर्ऋणं शुध्येत नो यदा ॥ २० ॥
In the full Agni Purana this is chapter 122, verse 20.
Apply it opposite to the Sun's correction. Add the ghatikas (24-minute units) of the tithi (moon day). If the minus can be taken away, the rest are the ghatikas. If it cannot,
Simple meaning: Apply the Sun's correction in reverse and add the moon day ghatikas. If the minus is too big, see the next verse.
सषष्टिकं प्रदेयं तत्षष्ठ्याधिक्ये च तत्त्यजेत् ।
If the minus is too big, borrow sixty. Above sixty, drop sixty. The star is found from the moon day.
रविचन्द्रौ समौ कृत्वा योगो भवति निश्चलः ।
Adding the Sun and Moon gives the almanac's daily combination. The moon day, worked by seven, gives its half.
तिथिश्च द्विगुणैकोना कृताङ्गैः करणं निशि ।
A sum on the moon day gives the half for the night. Fixed halves fall at the month's end and start.