saptanmas

Saptanmas is a term used in Indian astronomy and astrology to refer to the seven luminaries that could be observed with the naked eye: the Sun (Surya), the Moon (Chandra), Mars (Mangala), Mercury (Budha), Jupiter (Guru or Brihaspati), Venus (Shukra), and Saturn (Shani). In many Jyotisha traditions these seven bodies are collectively called sapta-graha or saptanmas and form the core set used for astrological calculations. When Rahu and Ketu—the lunar nodes—are included, the broader system is described as Navagraha, yielding a nine-body framework.

The saptanmas are used to track planetary positions within the zodiac, assess aspects and mutual relationships, and support predictive techniques such as dashas and transits. Their placements and movements influence the interpretation of a birth chart, the timing of events, and the selection of auspicious times in daily life and rituals. They also underpin the astronomical understanding of the zodiac and the regular weekly cycle, as each body is associated with certain days of the week in many Indian calendars (for example, Sunday with Surya and Monday with Chandra).

Historically, the saptanmas are treated as deities and as governing influences that affect natural phenomena and human affairs. The term reflects the ancient emphasis on seven principal celestial bodies in traditional Indian astronomy and astrology, prior to later expansions that incorporated additional factors and models.