Surya Siddhanta
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लब्धम् लिप्तादिकम् शोध्यम् गते देयम् भविष्यति। विपर्ययाद् वक्रगत्योर् एकस्मिम्स् तु धनव्ययौ॥
The quotient, in minutes, etc., is to be subtracted when the conjunction is past, and added when it is to come : if the two are retrograding, the contrary : if one is retrograding, the quotients are additive and subtfactive respectively.
english translation
Chapter 7
Verse 4
Verse 6