Surya Siddhanta
तत्रातिशीघ्रा शीघ्राख्या मन्दा मन्दतरा समा ।ऋज्वीति पञ्चधा ज्ञेया *या वक्रा सातिवक्रगा ॥(C +अन्या वक्रादिका मता)
Of these kinds, the five motions Atiśíghrá, Śíghrá, Mandá, Mandatabá and Samá are direct and the two motions Vakrá and Ativakrá are retrograde.
english translation
tatrAtizIghrA zIghrAkhyA mandA mandatarA samA ।RjvIti paJcadhA jJeyA *yA vakrA sAtivakragA ॥(C +anyA vakrAdikA matA)
hk transliteration by Sanscript