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Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Basics and Panchanga
ज्योतिषमूलं पञ्चाङ्गं च
स्थिरीकृतार्द्धरात्रार्द्धौ द्वयोर्विवरलिप्तकाः ।षष्टिश्चाचंद्रभुक्ताप्ता पातकालस्य नाडिकाः ॥ १८३ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 54, verse 183.
Take the fixed Moon and the Moon at midnight. Find the difference in minutes. Multiply by 60 and divide by the Moon's daily motion. This gives the ghatikas (24-minute unit) of the point's time.
Simple meaning: The gap between the fixed Moon and the midnight Moon gives the time of the point.
रवींद्वोर्मानयोगार्द्धं षष्ट्या संगुण्य भाजयेत् ।
Half the sum of the Sun's and Moon's sizes, times 60, divided by the difference in motion, gives the half-duration.
पातकालः स्फुटो मध्यः सोऽपि स्थित्यर्द्धवर्जितः ।
The mid-time less the half-duration is the start. Plus the half-duration is the end.
आद्यंतकालयोर्मध्ये कालो ज्ञेयोऽतिदारुणः ।
The time between the start and the end is harmful and should be avoided for every task.