Gayatri Upasana (Diamond Pocket Books) is a comprehensive spiritual guide authored by Dr. Radha Krishna Shrimali that explores the profound significance and practice of the Gayatri Mantra. The book provides a detailed roadmap for Sadhana (spiritual practice), including the correct methods for chanting, meditation techniques, and the performance of devotional rituals. It serves as a bridge between ancient Vedic wisdom and modern seekers, offering insights into how the mantra can facilitate mental peace, inner transformation, and spiritual awakening. Readers will find practical instructions on daily worship, the symbolism of Goddess Gayatri, and the protective \\\"Kavach\\\" (shield) associated with the mantra. Published by Diamond Pocket Books in India, this 160-page manual remains a cornerstone for devotees looking to integrate the power of divine light into their daily lives.