Spiritual Dimension of Vedic Astrology by Robert A Koch
The Spiritual Dimensions of Vedic Astrology is an original research into the spiritual connections between the sacred Vedic texts, and the predictive art of Jyotish. The book delves into many less- known, but relevant techniques of interpreting the spiritual aspects of the Vedic horoscope.
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The Book of Life: The Spiritual and Physical Constitution of Man by Alesha Sivartha (1898)