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Indian Astrology & Nakshatras

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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All questions with answers

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.

How does Indian astrology differ fundamentally from Western astrology?

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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.

How far have the Western and Indian zodiacs drifted apart by now?

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About 24 degrees

Nearly a whole sign. Someone who is Aries in the West is often Pisces in India: same birth, different sign.

What causes this shift between the two systems?

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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.

What is the correction value called with which Indian astrologers account for this difference?

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Ayanamsa

Schools argue over the exact figure: the common Lahiri ayanamsa is officially recognised, other traditions differ by one or two degrees.

Nakshatras

Foto: Saranya Ghosh · CC BY-SA 3.0 · Wikimedia Commons

What are the 27 lunar mansions of Indian astrology called?

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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.

How many nakshatras are there?

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27

Some traditions count 28 by inserting Abhijit. The 27 follow from the sidereal lunar month of about 27.3 days.

Which celestial body is central in Indian astrology (unlike in the West)?

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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.

What are the twelve zodiac signs called in Sanskrit?

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Rashi

Mesha (Aries), Vrishabha (Taurus), Mithuna (Gemini) and so on: the same images as in the West, a legacy of exchange with Hellenistic Greece.

What is a child's nakshatra traditionally used for?

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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.

The lunar nodes

Foto: Andres Rueda · CC BY 2.0 · Wikimedia Commons

Rahu and Ketu count as planets in Indian horoscopes. What are they really?

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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.

Nine

Foto: Anant Shivaji Desai, Ravi Varma Press · Public domain · Wikimedia Commons

How many celestial bodies does classical Indian astrology treat as planets?

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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.

What are horoscopes most commonly compared for in India to this day?

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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.

Where did India receive the twelve zodiac signs from?

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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.

Which Indian celestial system is older than the twelve zodiac signs?

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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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