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Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Basics and Panchanga
ज्योतिषमूलं पञ्चाङ्गं च
तद्वदेवैष्यलग्नासूनेवं व्याप्तास्तथा क्रमात् ।शेषं त्रिंशत्क्रमाद्व्यस्तमशुद्धेन विभाजितम् ॥ १५० ॥
In the full Narada Purana (Purva Bhaga) this is chapter 54, verse 150.
In the same way, take off the asus (4-second units) of the signs that follow. Do the same with the gone ones, in reverse order. Multiply the remainder by thirty. Divide it by the asus of the sign that could not be taken off.
Simple meaning: 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.
सपिंड्यांतरलग्नासूनेवं स्यात्कालसाधनम् ।
Time comes from the rising times in between. If the Sun is within 14 degrees of Rahu's axis, the Moon is eclipsed.