The 18 Ancient Astronomical Siddhantas.
The 18 Ancient Astronomical Siddhantas are as follows. While the general view is that the oldest Siddhanta is the Surya Siddhanta, it is stated in the Sambhu Hora Prakasa that Soma Siddhanta is the first, Brahma Siddhanta is the second and that Surya Siddhanta is the third.
- Saunaka or Soma
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