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Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Basics and Panchanga
ज्योतिषमूलं पञ्चाङ्गं च
एकायनगतौ स्यातां सूर्याचन्द्रमसौ यदा ।तयुते मंडले क्रांत्यौ तुल्यत्वे वै धृताभिधः ॥ १७४ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 54, verse 174.
Say the Sun and Moon are on one course. Their sum makes a full circle. Their declinations are equal. Then it is called Vaidhriti.
Simple meaning: When the Sun and Moon are on the same course and have equal declinations, Vaidhriti occurs.
विपटीतायनगतौ चंद्रार्कौ क्रांतिलिप्तिकाः ।
When the Sun and Moon are on opposite courses with equal declinations, Vyatipata occurs.
भास्करेंद्वोर्भचक्रांतचक्रार्द्धावधिसंस्थयोः ।
When the Sun and Moon together are near 360 or 180 degrees, find each one's declination.
अथोजपदगम्येंदोः क्रांतिर्विक्षेपसंस्कृता ।
Correct the Moon's declination by its latitude. If it is greater than the Sun's, the point has passed.