Surya Siddhanta
विस्तरेणैतद् उदितम् सम्क्षेपाद् व्यावहारिकम्। मध्यमानयनम् कार्यम् ग्रहाणाम् इष्टतो युगात् ॥
These processes are mentioned (from 45th Śloka to 54th) in detail, but, for convenience' sake, let (an astronomer) computing the elapsed terrestrial days from the beginning of the Tretá yuga, find easily the mean places of the planets.
english translation
vistareNaitad uditam samkSepAd vyAvahArikam। madhyamAnayanam kAryam grahANAm iSTato yugAt ॥
hk transliteration by Sanscript