Why Indian astrology tracks nine celestial bodies, including two that are entirely invisible.

Nature · Published 3 October 2026 Swipe more like this →

In short: The navagraha are nine celestial entities believed to shape human destiny. While seven correspond to the Sun, Moon, and visible planets, two are shadow planets—Rahu and Ketu—that possess no physical form. Together, these forces are thought to influence everything from health and marriage to personal success and failure.

The term navagraha derives from the Sanskrit words for nine and planet, though the concept of a graha implies a seizer or one that grasps. In Indian astrology, these entities are thought to overtake fixed stars or exert direct control over human lives. While early Vedic texts focused on the Sun, Moon, and stars, the systematized group of nine emerged through centuries of cultural exchange. The five visible planets were integrated into Indian thought following contact with Hellenistic culture and Babylonian astronomy in the centuries before the common era.

The shadow planets, Rahu and Ketu, are unique to this tradition. Mythologically, Rahu is a demon who, after being beheaded by the god Vishnu, retained immortality as a severed head. By the 8th or 9th century ce, these figures were firmly established as the northern and southern nodes of the Moon, the specific points where the Moon crosses the ecliptic to cause eclipses. Because they are bodiless, they are considered consistently negative, alongside Saturn, while others like Jupiter and Venus are generally viewed as benefics.

Practitioners believe that planetary alignments at birth and throughout life create doshas, or negative impacts, which can be mitigated through specific rituals. In Hindu temples, the navagraha are often arranged on a square altar where they do not face one another, with the Sun positioned at the center. Devotees circumambulate these altars clockwise to pacify the deities and invite positive outcomes. This tradition extends to pilgrimage routes, such as the nine-temple circuit in Tamil Nadu, and even into Jain practice, where the planets are associated with Tirthankaras to help followers overcome karmic impediments.

The influence of these bodies is so deeply embedded that the seven-day week, adopted in India after the 3rd century ce, is structured around the first seven navagrahas. Whether through wearing astrologically significant gemstones or performing temple offerings like sesame oil, the goal remains the same: to secure one's fate against the unpredictable movements of these cosmic agents.

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