Brihat Samhita
Where Brihat Jataka reads a person, Brihat Samhita reads the world. Across 106 chapters Varahamihira gathers the samhita branch of jyotish: the courses of the planets, the meaning of comets and eclipses, the prediction of rainfall, the rules for laying out a house or temple, the testing of pearls and gems, signs read from animal behaviour, and a handful of natal-relevant chapters on planetary qualities and birth in the asterisms. Iyer's 1884 translation, the same hand that gave us Brihat Jataka, keeps Varahamihira's clarity intact across a vast span of subjects.
This is the same Varahamihira who wrote Brihat Jataka, here turning his attention from the individual chart to the world. Brihat Samhita is the encyclopedia of the samhita branch of jyotish: the omens, geography, agriculture, architecture, and natural-science territory that classical Indian astrology covered alongside natal work. For centuries it served as the working reference for court astrologers, kings deciding when to plant or build, civic planners, and gemologists. What makes the text remarkable today is its breadth: chapters on testing the quality of pearls and emeralds sit alongside chapters on rainfall prediction, the layout of temples, the meaning of comets, and the behavior of animals before storms. It preserves a window into sixth-century Indian science that is hard to find anywhere else, not just astrology. N. Chidambaram Iyer's 1884 English translation, the same hand that gave us Brihat Jataka, keeps Varahamihira's voice intact across the full sweep.