Grahas are not planets: the nine "seizers"

A word that does not translate

Graha is usually translated "planet". That is convenient, but it misleads. The word comes from the Sanskrit root grah, "to seize, to grasp". A graha is something that seizes or takes hold: in this case, something in the sky whose movement is held to take hold of earthly affairs. The same root gives grahana, eclipse, the "seizing" of the Sun or Moon.

The Greek planetes means "wanderer", a body that moves against the fixed stars. Modern astronomy restricts "planet" further, to large bodies orbiting the Sun. By either definition the list of nine grahas is not a list of planets.

The nine

The navagraha, nine grahas, are:

1. Surya, the Sun
2. Chandra, the Moon
3. Mangala, Mars
4. Budha, Mercury
5. Guru or Brihaspati, Jupiter
6. Shukra, Venus
7. Shani, Saturn
8. Rahu, the ascending lunar node
9. Ketu, the descending lunar node

The Sun is a star and the Moon a satellite. Rahu and Ketu are not bodies at all. Uranus, Neptune and Pluto, invisible to the naked eye, are not part of the classical scheme.

What the nine have in common is not physical type but role. Each moves along the zodiac at its own rate, and each is assigned a set of significations in the texts.

Rahu and Ketu: two points, not two bodies

The Moon's orbit is tilted about five degrees to the ecliptic, the Sun's apparent path. The two orbits cross at two points, the nodes. The node where the Moon crosses northward is Rahu; the opposite node, exactly 180 degrees away, is Ketu. The nodes move backwards (retrograde) round the zodiac in about 18.6 years.

Eclipses can happen only when the Sun and Moon are near a node. That is the astronomical core of the Puranic story in which the demon Svarbhanu, beheaded by Vishnu after tasting the nectar of immortality, survives as Rahu (the head) and Ketu (the body) and periodically "seizes" the Sun and Moon. Indian astronomers distinguished the myth from the mechanism clearly. Aryabhata and later Brahmagupta explained eclipses as the shadow of the Earth falling on the Moon and the Moon covering the Sun, and the Siddhanta texts compute them from the positions of the nodes.

The daily Rāhu kāla in the panchang is a separate convention, a fixed fraction of daytime assigned to Rahu by weekday. It does not depend on where the node actually is.

How the grahas are characterised

Classical texts give each graha a set of qualities. A few of the common categories:

• Natural benefic and malefic (saumya and krura). Jupiter and Venus are usually counted as natural benefics; Saturn, Mars, the Sun, Rahu and Ketu as natural malefics. The Moon and Mercury depend on condition: a waxing Moon and an unafflicted Mercury are counted with the benefics.
• Sign rulership. The Sun rules Simha, the Moon rules Karka, and the five others each rule two signs. Rahu and Ketu are given rulerships in some texts and not in others.
• Exaltation and debilitation. Each graha has a sign where it is "exalted" (uccha) and the opposite sign where it is "debilitated" (nicha). The Sun is exalted in Mesha and debilitated in Tula, for example.
• Friendship. Texts give tables of natural friendship, neutrality and enmity among the grahas.
• Significations (karakatva). The Sun signifies the father and authority, the Moon the mother and the mind, Mars siblings and energy, Mercury speech and learning, Jupiter teachers and children, Venus the spouse and the arts, Saturn time, labour and endurance.

These are classifications inside a symbolic system. They describe how the texts reason, not physical effects of bodies.

Speed matters

The grahas are distinguished also by how fast they move through the zodiac. The Moon passes through a sign in about two and a quarter days; the Sun in about a month; Jupiter in about a year; Saturn in about two and a half years; Rahu and Ketu in about eighteen months. These speeds shape the techniques built on them. A slow graha moving through a sign marks a long phase in Gocara, the study of transits; the Moon's fast motion defines the tithi and the nakshatra. The Vimśottarī daśā Daśā system assigns each graha a fixed number of years, from six for the Sun to twenty for Venus.

Why the distinction is worth keeping

Calling grahas "planets" invites a modern reader to imagine physical forces from distant bodies, and then to dismiss the whole subject when no such force can be found. The Sanskrit term points somewhere else: to a set of moving reference points in a long-established interpretive language. Knowing what a graha is, and is not, is the first step to reading the classical texts on their own terms.

Try it

The Kundli tool shows where each graha stood at a given moment, the Transits tool shows where they are now, and the Dasha tool shows the period each one governs.

Taught in

The qualities of the grahas are Module 3 of our Certificate Programme in Predictive Astrology, offered as FORE × Deepanshu Giri Ji. The programme has 60 hours of learning engagement: 30 hours of live teaching on weekends and 30 hours of self-paced research. The fee is ₹35,000 + applicable GST.