Brihat Parashara Hora Shastra
कथयामि घटीलग्नं सृनु त्वं द्विजसत्तम। सूर्योदयत् समारभ्य जन्मकालावधि क्रमात्॥ ६॥
Ghati Lagn (Ghatik Lagn). Now listen to the method of working out Ghati Lagn. This Lagn changes along with every Ghati (24 minutes) from the sunrise. Note birth time in Ghatis and Vighatis.
english translation
kathayAmi ghaTIlagnaM sRnu tvaM dvijasattama। sUryodayat samArabhya janmakAlAvadhi kramAt॥ 6॥
hk transliteration by Sanscript