Sun
In astrology, the Sun is treated as one of the 10 'planets' — in the ancient sense of the term, any body that moves against the fixed background of stars. It is the ruler of Leo and, in popular Western astrology, the most common starting point for determining someone's 'sign.'
Last reviewed: 2026-07-20
Historical fact
The Sun is a star, not a planet, under modern astronomical classification. But the original Greek word for 'planet,' planētes ('wanderer'), designated any visible celestial body that moved relative to the fixed background of stars — a category that included the Sun, Moon, Mercury, Venus, Mars, Jupiter and Saturn under the geocentric astronomy of antiquity. These seven classical 'planets' form the basis of the astrological system systematized by Ptolemy in the Tetrabiblos, around 150 CE, and remained the full set used by Western astrology until the discovery of Uranus in 1781.
Interpretation — Western Astrology (Tropical)
In modern Western astrology, the Sun represents core identity, vitality and sense of purpose — the conscious 'self' around which personality organizes. It's astrology's most popularized reference point (the 'sun sign'), though technically just one of several factors in a full birth chart. Rulership: Leo. Symbolically associated with the father, authority and public life.
Interpretation — Vedic Astrology (Sidereal)
In the Vedic system (Jyotish), the Sun is called Surya and is one of the nine Navagraha. Unlike popular Western astrology, Jyotish does not use the sun sign as its primary starting point — that central role belongs to the moon sign (Rashi), calculated from the Moon's position at birth, not the Sun's. Surya is associated with the soul (atma), the father and authority, and is considered regal in nature — but its position is not the chart's organizing axis, as it commonly is in popular Western use.
This section presents one tradition's interpretation, not a verifiable fact.
Frequently asked questions
- Why is the Sun called a 'planet' in astrology if it's a star?
- Because astrology uses the original sense of the Greek word planētes ('wanderer'): any celestial body that moves relative to the fixed background of stars. That ancient definition includes the Sun and Moon, even though modern astronomy classifies them differently (a star and a natural satellite, respectively).
- Is the sun sign the same thing in Western and Vedic astrology?
- Not exactly. In popular Western astrology, the sun sign is the most commonly used data point to describe someone. In Vedic astrology (Jyotish), the chart's central axis is the moon sign (Rashi), not the sun sign — a structural difference between the two traditions, beyond the date shift caused by the sidereal zodiac.
Sources
- Nicholas Campion. A History of Western Astrology (2009).
- Claudius Ptolemy. Tetrabiblos (c. 150).
- Maharishi Parashara (trans. R. Santhanam). Brihat Parashara Hora Shastra (1984).
- David Pingree. From Astral Omens to Astrology: From Babylon to Bīkāner (1997).