Surya Siddhanta

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उदयास्तविधिः प्राग्वत् कर्तव्यः शीतगोर् अपि। भागैर् द्वादशभिः पश्चाद् दृश्यः प्राग् यात्य् अदृश्यताम्॥

For the moon too, the calculation of rising (udaya) and setting (asta) is to be done as before. If located at twelve degrees west, it (the moon) is visible and if located at twelve degrees east, it becomes invisible.

english translation