Surya Siddhanta

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शुक्लम् कर्णेन तद्बिम्बयोगाद् अन्तर्मुखम् नयेत् । शुक्लाग्रयाम्योत्तरयोर् मध्ये मत्स्यौ प्रसाधयेत्॥

And lay off upon the hypothenuse, from the point of its intersection with the disk, in an inward direction, the measure of the illuminated part : between the limit of the illuminated part and the north and south points draw two fish-figures (matsya); -

english translation