Which Panchang to Buy/Use कौन सा पंचांग खरिदें (Hindi) by Prem Shankar Uday Shankar Dave

A small book explaining as to which panchang is reliable

Price INR 55

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Kaal Ganana Aur Panchang काल गणना और पंचाग (Hindi) by Sukhvir Singh Gehlot

Elements of Astronomy and Astrological Calculations by V P Jain

A Text Book of Shadbala and Bhavabala by V P Jain