Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Basics and Panchanga
ज्योतिषमूलं पञ्चाङ्गं च
ज्योतिषांगं प्रवक्ष्यामि यदुक्तं ब्रह्मणा पुरा ।यस्य विज्ञानमात्रेण धर्मसिद्धिर्भवेन्नृणाम् ॥ १ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 54, verse 1.
I will explain the limb of jyotisha (astrology) that Brahma spoke long ago. Just by knowing it, people succeed in their religious duties.
Simple meaning: Brahma once taught astrology. Knowing it helps people succeed in their duties.
त्रिस्कंधं ज्यौतिषं शास्त्रं चतुर्लक्षमुदाहृतम् ।
Astrology has three branches: planet maths, birth chart reading, and world events.
गणिते परिकर्मादि खगमध्यस्फुटक्रिंये ।
Planet maths covers basic sums, true planet positions, eclipses, and risings and settings.
छाया शृङ्गोन्नतियुती पातसाधानमीरितम् ।
Planet maths also covers shadows and the Moon's horns. Birth charts cover the kinds of signs and planets.