While not a "book," several free offline Vedic astrology software programs allow you to generate charts based on the Vakya system.
: This platform hosts various Samvatsara Siddhanta Panchangams, including the Sri Roudri Nama Samvatsara 1980-81 published by TTD in Telugu. vakya panchangam 1980 free
Some free astrology portals allow you to generate historical panchangam data. Try: While not a "book," several free offline Vedic
Based on the distance between the sun and the moon. Try: Based on the distance between the sun and the moon
: Because it relies on predefined tables rather than complex real-time orbital calculations, it is often simpler for traditional practitioners to navigate than the "Drik" (observation-based) systems. Saptarishis Astrology Magazine Performance & Accuracy
For the year 1980, the Vakya Panchangam encompasses two traditional Tamil years: (ending April 1980) and (beginning April 1980). Free Digital Resources for 1980 You can access scanned copies of the original Maruthuvakudi Vakya Panchangam