It is considered the "bible" of Vedic astrology. 2. Deva Keralam (Chandra Kala Nadi) (3 Volumes)

The Ultimate Guide to R. Santhanam’s Astrology Books and PDF Resources

For those searching for "R. Santhanam astrology books PDF," several legitimate platforms host these works for educational research: Saravali of Kalyana Varma / Srval