Surya Siddhanta

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रवीन्दुमानयोगार्धम् षष्ट्या सङ्गुण्य भाजयेत् । तयोर् भुक्त्यन्तरेणाप्तम् स्थित्यर्धम् नाडिकादि तत्॥

Multiply the half-sum of the dimensions (mana) of the sun and moon by sixty, and divide by the difference of their daily motions : the result is half the duration (sthiti), in nadi, etc.

english translation