Surya Siddhanta
एवम् स्वशीघ्रमन्दोच्चा ये प्रोक्ताः पूर्वयायिनः। विलोमगतयः पातास् तद्वच् चक्राद् विशोधिताः ॥
In the same way, the mean places of the Śíghrochcha and Mandochcha (apogee) whose direct revolutions (in a Kalpa) are mentioned before, and those of the nodes of the planets can be found. But the places of the nodes, thus found, must be subtracted from twelve signs, because their motions are contrary to the order of the signs.
english translation
evam svazIghramandoccA ye proktAH pUrvayAyinaH। vilomagatayaH pAtAs tadvac cakrAd vizodhitAH ॥
hk transliteration by Sanscript