The panchangam calculation requires two important heavenly bodies – the sun and the moon, and will be as accurate as how these heavenly bodies are calculated. In ancient times, there were many methods of calculating them. The most ancient one is Surya Siddhanta, another is the Vakyam Siddhanta and the later one is the Driga Ganita (Thirukanitha). The Vakyam is an ancient system where planetary motions are described in simple sentences (hence the vakya). The Vakyam comes out as an unmodified panchagam of anciant system.
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