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Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Basics and Panchanga
ज्योतिषमूलं पञ्चाङ्गं च
उत्क्रमेण षडेवैते भवंतीष्टास्तुलादयः ।गतभोग्यासवः कार्याः सायनास्स्वेष्टभास्कराः ॥ १४८ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 54, verse 148.
In reverse order these same six become the wanted signs, from Libra on. Work out the gone and the yet-to-come asus (4-second units) from the Sun at the wanted time. Use its sayana (counted from the equinox) place.
Simple meaning: Libra onward use the same six figures in reverse. Work out the gone and coming parts from the Sun.
तद्वदेवैष्यलग्नासूनेवं व्याप्तास्तथा क्रमात् ।
Take off the rising times sign by sign. Turn what is left into degrees of the next sign.
भागयुक्तं च हीनं च व्ययनांशं तनुः कुजे ।
Add or take off the degrees and remove the equinox shift to get the rising sign.
भानौ क्षयधने कृत्वा मध्यलग्नं तदा भवेत् ।
Adjust the Sun to find the sign on the meridian. Then start the rule for finding the time.