What is traditional Indian astrology called?
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Jyotisha
Literally "science of light". It counts as one of the six Vedangas, the auxiliary sciences of the Vedas, and served above all for calendars and ritual timing.
15 questions · Mythology
Ask someone in India for their star sign and you may get a different answer than in Europe and both are right, because they calculate differently. Western astrology is tropical: it ties the start of Aries to the spring equinox. Indian Jyotisha is sidereal, aligned to the actual stars. Because the Earth's axis wobbles (precession, one turn in roughly 25,800 years) the two systems drift apart: by now about 24 degrees, nearly a whole sign. Someone who is Aries in the West is therefore often Pisces in India. The twelve signs are called rashi there and carry the same images: Mesha the ram, Vrishabha the bull. More important in daily life, though, is a second grid: the 27 nakshatras, the lunar mansions. They divide the sky by the course of the moon, which takes a good 27 days for one circuit, and each mansion has its own name, symbol and deity: Ashwini, Bharani, Krittika and so on. Families choose wedding dates by them, and traditionally the first letter of a child's name too. Another peculiarity: unlike in the West, the moon plays the leading role, not the sun. And the planet Rahu that appears in horoscopes is no planet at all but a calculated point: the lunar node, where eclipses happen.
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Jyotisha
Literally "science of light". It counts as one of the six Vedangas, the auxiliary sciences of the Vedas, and served above all for calendars and ritual timing.
It calculates sidereally, not tropically
The Western system anchors its zero point to the spring equinox, the Indian one to the actual stars. All signs therefore shift against each other.
About 24 degrees
Nearly a whole sign. Someone who is Aries in the West is often Pisces in India: same birth, different sign.
The precession of the Earth's axis
The axis wobbles like a spinning top, taking some 25,800 years for one turn. The equinox point slowly wanders through the constellations.
Ayanamsa
Schools argue over the exact figure: the common Lahiri ayanamsa is officially recognised, other traditions differ by one or two degrees.
Foto: Saranya Ghosh · CC BY-SA 3.0 · Wikimedia Commons
Nakshatras
They divide the zodiac by the moon's course, which takes a good 27 days. Each has a name, symbol and deity: Ashwini opens the series.
27
Some traditions count 28 by inserting Abhijit. The 27 follow from the sidereal lunar month of about 27.3 days.
The moon
The birth sign there follows the moon's position, not the sun's. Many Indians therefore know their moon sign better than their sun sign.
Rashi
Mesha (Aries), Vrishabha (Taurus), Mithuna (Gemini) and so on: the same images as in the West, a legacy of exchange with Hellenistic Greece.
The first letter of the name
Each mansion is divided into four quarters (padas), each with assigned syllables. Many families pick the given name accordingly: astrology as a naming register.
Foto: Andres Rueda · CC BY 2.0 · Wikimedia Commons
The lunar nodes
The two points where the moon's orbit crosses Earth's, where eclipses occur. Myth turns them into a demon beheaded mid-swallow: Rahu gulps the sun, which falls out below.

Foto: Anant Shivaji Desai, Ravi Varma Press · Public domain · Wikimedia Commons
Nine
The Navagraha: sun, moon, Mercury, Venus, Mars, Jupiter, Saturn plus Rahu and Ketu. Uranus, Neptune and Pluto are missing: discovered after the system took shape.
For matchmaking and wedding dates
In kundali matching, points (gunas) are counted; above a threshold the match counts as suitable. Marriage adverts often list the birth chart next to the profession.
From Hellenistic Greece
They reached India from the 2nd century onward through contact after Alexander's campaign; the nakshatras, by contrast, are older and genuinely Indian, already found in the Vedic texts.
The nakshatras
The lunar mansions appear in Vedic texts long before the twelve signs. The moon system is the native core, the solar zodiac the import.
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