Surya Siddhanta

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छायाकर्णौ तु कोणेषु यथास्वम् देशकालयोः । त्रिज्योदक्चरजायुक्ता याम्यायाम् तद्विवर्जिता ॥

Add or subtract the sine of the ascensional difference to or from the radius according as the Sun is in northern or southern hemisphere. The result is called the Antyá. From the Antyá subtract the versed sine of the time from noon (reduced to degrees); Multiply the remainder by the cosine of the declination.

english translation

chAyAkarNau tu koNeSu yathAsvam dezakAlayoH । trijyodakcarajAyuktA yAmyAyAm tadvivarjitA ॥

hk transliteration by Sanscript