Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Basics and Panchanga
ज्योतिषमूलं पञ्चाङ्गं च
समावर्तनवैवाहप्रतिष्ठासद्मलक्षणम् ।यात्राप्रवेशनं सद्योवृष्टिः कर्मविलक्षणम् ॥ ११ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 54, verse 11.
The return after study, marriage, the setting up of images, and the marks of a house. Journeys, entering a house, and sudden rain. The marks of different kinds of acts.
Simple meaning: More topics: ending study, marriage, house features, journeys, house entry, sudden rain and kinds of acts.
उत्पत्तिलक्षणं चैव सर्वं संक्षेपतो ब्रुवे ।
I will explain all this briefly. Then the places of numbers are named, from one up to a lakh.
स्वाहोरात्रचतुर्भागे दिनरात्रिदले स्मृते ।
A quarter of a planet's day-and-night, corrected, gives half its day and night. Double them for the full lengths.
भभोगोऽष्टशतीर्लिप्ताः स्वाश्विशैलोस्तथातिथेः ।
A nakshatra spans 800 minutes of arc and a tithi 720. Divide a planet's minutes by 800 to get its nakshatra.