Vedic Astrology Glossary
Fixed Star Zodiac
The sidereal zodiac is the basis of Vedic astrology - a zodiac anchored to the actual positions of fixed stars rather than to the vernal equinox. It currently sits approximately 23° - 24° behind the Western tropical zodiac, a gap called the ayanamsha.
There are two major zodiacs used in astrology. The tropical zodiac (used in Western astrology) defines 0° Aries as the spring equinox point - a moving, astronomical reference tied to Earth's axial cycle. The sidereal zodiac (used in Vedic astrology) defines 0° Aries in relation to the actual fixed stars, specifically the star Spica at 0° Libra in the Chitrapaksha (Lahiri) ayanamsha.
Because Earth's axis precesses (wobbles) at about 50 arcseconds per year, the two zodiacs drift apart by roughly 1° every 72 years. Over the past 2,000 years, the accumulated drift (ayanamsha) has grown to approximately 23° - 24°. This is why a person born with the sun at 5° Aries in the tropical zodiac has their sun at approximately 11° Pisces in the sidereal zodiac - technically a different sign.
Ayanamsha systems differ slightly among Vedic astrologers. The most widely used is the Lahiri ayanamsha (officially adopted by the Indian government for the national almanac). Others include Raman, Krishnamurti, Yukteshwar, and True Citra. Stellr uses Lahiri.
Proponents of the sidereal zodiac argue that its alignment with actual stellar positions provides a more cosmologically grounded map of planetary influences, while tropical advocates emphasize the equinox-based seasonal symbolism.
Concept map
3 terms
Vedic Zodiac Sign
Rashi is the Vedic term for zodiac sign. The 12 rashis are calculated using the sidereal zodiac (fixed stars), placing them approximately 23° behind their Western tropical counterparts. In Jyotish, the moon's rashi at birth is often considered more personally significant than the sun's rashi.
Lunar Mansion
A nakshatra is one of 27 lunar mansions that divide the zodiac into equal 13°20′ segments. The moon's placement in a nakshatra at birth reveals personality nuances, emotional rhythms, and karmic themes that the broader rashi (zodiac sign) cannot capture.
Ascendant / Rising Sign
Lagna is the degree of the zodiac rising on the eastern horizon at the exact moment of birth. It sets the first house of the chart, determines house rulerships, and acts as the chart's structural foundation - the body, self-expression, and life path.
If you were born between approximately April 14 and May 14, your Vedic sun sign is also Aries (Mesha). If you were born between March 21 and April 13 in the Western system, your Vedic sun sign is actually Pisces (Meena), because of the ~23° ayanamsha gap.
Both systems have internal consistency and centuries of accumulated interpretive tradition. Vedic astrology's predictive and timing methods (dasha, transit, divisional charts) are developed specifically for the sidereal zodiac and do not transfer directly to the tropical system.
Most people's Sun sign shifts back by one zodiac sign in Vedic astrology because of the ~23° gap between the tropical and sidereal zodiacs (called the ayanamsha). For example, someone born with the Sun at 10° Aries (tropical/Western) actually has the Sun at approximately 17° Pisces (sidereal/Vedic). In Vedic astrology, the Sun sign matters less than the Moon sign and the rising sign (lagna) for personality analysis, so this shift is less jarring than it initially appears.
Birth Chart Report
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