Chandra and the Mind: Why Hinduism Linked the Moon to Mood Swings Thousands of Years Ago In Hindu tradition, the universe operates through cosmic forces that influence life on earth at every level. Among these forces, the Navagraha — the nine celestial bodies — hold a position of supreme importance. Each graha governs a specific domain of human existence. Chandra, the moon deity, is not merely the ruler of the night sky. Chandra governs the mind, emotions, and the inner world of human consciousness. This assignment was not arbitrary. It emerged from deep observation, spiritual insight, and a sophisticated understanding of nature's rhythms. Chandra as the Ruler of the Mind The Brihat Parashara Hora Shastra, the foundational text of Vedic astrology, declares Chandra as the karaka — the significator — of the mind (manas). The mind in Hindu philosophy is not simply the brain. It is the seat of emotions, perceptions, memory, and feeling. Chandra rules over all of this. When Chandra ...