Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
प्रवर्षणां समे गर्भौ नाक्षत्रेण प्रगृह्यते ।यात्रोद्वाहव्रतक्षौरे तिथिवर्षेशनिर्णयः ॥ ११२ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 112.
The rain showers, the year and the two pregnancies are taken by the star measure. For a journey, marriage, vow and shaving, the tithi (moon day) and the year lord are settled.
Simple meaning: Rain and the year are counted by the stars. Journeys, marriages, vows and shaving need the moon day and year lord.
पर्ववास्तूपवासादि कृत्स्नं चांद्रेण गृह्यते ।
Fasts and house rites follow the Moon. The sixty-year names follow Jupiter.
तत्तन्मासैर्द्वादशभिस्तत्तदष्टौ भवेत्ततः ।
Twelve months of any kind make a year. Jupiter's average movement gives the sixty named years.
प्रभवो विभवः शुक्लः प्रमोदोऽथ प्रजापतिः ।
These are the first ten names of the sixty-year cycle.