The Pancha Siddhantika reviews and compares five earlier astronomical systems — a survey of competing models, with their methods of computing planetary position and eclipse.
Surya Siddhanta
Sixth century CE · century · probable
Dated from internal astronomical parameters
Ujjain — today Ujjain, Madhya Pradesh (traditional)
Astronomy and Earth science · CBSE · ICSE · IGCSE · IB — Jyotisha — Ganita and Gola (spherics). Rotation and revolution, eclipse prediction and geometry, planetary models, instruments, the calendar and time-reckoning.
Evidence: probable · no modern scholarly reference recorded yet.