The is a traditional Tamil almanac based on ancient astronomical formulas expressed as simple sentences (vakyas) to facilitate memorization. For the year 1980 , which corresponds to the Tamil years Siddharth (1979–1980) and Roudhri (1980–1981), you can find historical data and digital archives for reference. Digital Archives for 1980 Vakya Panchangam
: The Internet Archive hosts the Sri Roudri Nama Samvatsara Sidhanta Panchamgam (1980-81) , which includes planetary positions and tithi data published by TTD. vakya panchangam 1980 free