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Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Basics and Panchanga
ज्योतिषमूलं पञ्चाङ्गं च
भभोगोऽष्टशतीर्लिप्ताः स्वाश्विशैलोस्तथातिथेः ।ग्रहलिप्ता भगाभोगाभानि भुक्त्यादिनादिकम् ॥ १२३ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 54, verse 123.
The nakshatra (star) extent is 800 minutes of arc. Likewise the tithi (moon day) extent is 720 minutes. A planet's minutes divided by the star extent give the stars passed. The remainder divided by its daily motion gives the days and so on.
Simple meaning: A nakshatra spans 800 minutes of arc and a tithi 720. Divide a planet's minutes by 800 to get its nakshatra.
रवींदुयोगलिप्तास्तु योगाभभोगभाजिताः ।
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.