[4][5] Sankaranarayana is known to have established an astronomical observatory at the port of Mahodayapuram, present-day Kodungallur, in central Kerala.
[8] According to the commentary, Sankaranarayana installed an astronomical observatory at the Chera capital Mahodayapuram (on the Malabar Coast).
The opening verse of the commentary gives an indirect invocation or praise to the lord called "Sthanu" (carefully composed to be applicable to god Siva and the ruling king).
[12] "Angartvambara nanda devamanubhir yate dinanam ganeGraste tigma mayukhamalinitamobhute parahne diviPrsta praggrahanad dvitiyaghatika grasa pramanam raverBharta sri Kulasekharena vilasad velavrtaya bhuva.
""Capapravista guru sauri samatva kalamYamyottaram gamanamantaratah pramanamAcaksvya sarvamavagamya bhatoktamargadItyuktavan ravirasena nrpabhivandya.