Sankaranarayanan, a famous astronomer during the reign of the Perumals wrote :
AAryabhatiyam
BPanchasiddhantika
CSankaranarayaneeyam
DSuryasiddhanta
AAryabhatiyam
BPanchasiddhantika
CSankaranarayaneeyam
DSuryasiddhanta
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What are the major ports in medieval Kerala?