Surya Siddhanta
वलनाग्रान् नयेन् मध्यम् सूत्रम् यद्य् अत्र सम्स्पृशेत् । तत्समासे ततो देयौ विक्षेपौ ग्रासमौक्षिकौ॥
From the extremity of either deflection draw a line to the centre : from the point where that cuts the aggregate-crrcle (samdsa) are to be laid off the latitudes of contact and of separation.
english translation
valanAgrAn nayen madhyam sUtram yady atra samspRzet । tatsamAse tato deyau vikSepau grAsamaukSikau॥
hk transliteration by Sanscript