Subbannachar

Panchangam defines the five elements of Time at a given place: Thithi, 2. Vara (Week Day), 3.Nakshatra, 4. Yoga and 5.Karana.

Local sunrise time: – the most definite factor to determine the Thithi, Vara, Nakshatra, Yoga and Karana.

Publications:
Bhavasangraha
Krishna Stotra RamacharyaVirachita
Narayana Shabdartha
SriMaghaMasaMahatyam Part 1
SriMaghaMasaMahatyam Part2