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Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Basics and Panchanga
ज्योतिषमूलं पञ्चाङ्गं च
रवींदुयोगलिप्तास्तु योगाभभोगभाजिताः ।गतगम्याश्च षष्टिघ्ना भुक्तियोगातनाडिकाः ॥ १२४ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 54, verse 124.
Add the minutes of the Sun and Moon. Divide by the star extent (800 minutes). That gives the yogas (Sun-Moon yoga of the almanac). The gone and the yet-to-come parts, times 60, are divided by the sum of the daily motions. That gives the ghatikas (24-minute unit).
Simple meaning: Add the Sun and Moon minutes and divide by 800 to get the yoga. Then find the ghatikas.
अर्कोनचंद्रलिप्तास्तु तिथयो भोगभाजिताः ।
Moon minus Sun, divided by 720, gives the tithi. Then find the ghatikas.
तिथयः शुक्लप्रतिपदो द्विघ्नाः सैका न गाहताः ।
Count tithis from the first of the bright half, double, add one, divide by 7. The remainder names the karana.
वणिजोभ्रे भवेद्विष्टिः कृष्णभूतापरार्द्धतः ।
After Vanija comes Vishti. Four fixed karanas fall from the last half of the dark 14th.