Brihat Parashara Hora Shastra
गच्छन्तो भानि गृह्णन्ति सततं ये तु ते ग्रहः। भचक्रस्य नगश्व्यंशा अश्विन्यादिसमाह्वयाः॥ ४॥
Those are called „Grahas‟, that move through the Nakshatras (or stellar mansions) in the zodiac. The said zodiac comprises of 27 Nakshatras commencing from Ashvini.
english translation
gacchanto bhAni gRhNanti satataM ye tu te grahaH। bhacakrasya nagazvyaMzA azvinyAdisamAhvayAH॥ 4॥
hk transliteration by Sanscript