The 27 Nakshatras: How Vedic Astronomy Divides the Sky

The Vedic system of astronomy predates the Greek zodiac system in India by at least 1,000 years. The ancient Rigveda itself, composed around 1500–1200 BCE, references the nakshatra system, the traditional Hindu system built around the Moon’s sidereal orbital period.

A sidereal period is the time it takes the Moon to make a complete orbit against the background of stars. Indian astronomers divided the ecliptic into 27 equal segments exactly 13°20′ wide. The Moon moves about 13°10′ per day on average, so the fit is close, but not perfect.

What are the Nakshatras?

Navamsa calculator: each nakshatra divided into four padas, mapped to its navamsa sign

Jaivanth, CC BY-SA 4.0, via Wikimedia Commons

There are 27 Nakshatras (28 in some traditions), each associated with a star or cluster of stars near its center. This separates it from the tropical zodiac, which is timed to the spring equinox and has drifted roughly 24 degrees due to precession, accumulating from 285 CE, when the tropical and sidereal zero points last coincided, from about 1,740 years ago. That gap is the ayanamsa, and the Lahiri value stands at about 24°13′ for 2026. The nakshatras stay with the stars. The Moon is the primary focus, but anything moving along the ecliptic, planets included, can be placed within the system the same way.

The division is named for its star or asterism. These are celestial markers you can see with your naked eye on a clear night: the Pleiades for Krittika, Aldebaran for Rohini, Spica for Chitra, Antares for Jyeshtha, Vega for Abhijit when the 28-nakshatra count is used.

The twenty-seven names

By tradition, the 27 named segments are associated with a star or asterism and have both Sanskrit and modern astronomical identities.

1. Ashvini: β and γ Arietis. “The horsemen.” The first nakshatra, marking the head of Aries.

2. Bharani: 35, 39, 41 Arietis. “The bearer.” Three faint stars in Aries.

3. Krittika: the Pleiades (M45). “The cutters.” A tight cluster of six visible stars in Taurus.

4. Rohini: Aldebaran (α Tauri). “The red one.” The brightest star in Taurus.

5. Mrigashira: λ and φ Orionis. “The deer’s head.” The head of Orion in Vedic figuration.

6. Ardra: Betelgeuse (α Orionis). “The moist one.” Associated with storms.

7. Punarvasu: Castor and Pollux (α and β Geminorum). “Return of the good.” The twin stars of Gemini.

8. Pushya: γ, δ, θ Cancri. “The nourisher.” Considered auspicious.

9. Ashlesha: δ, ε, η, ρ, σ Hydrae. “The embrace.” The five stars of the head of Hydra.

10. Magha: Regulus (α Leonis). “The mighty.” The royal star.

11. Purva Phalguni: δ and θ Leonis. “Former reddish one.”

12. Uttara Phalguni: Denebola (β Leonis). “Latter reddish one.”

13. Hasta: δ, γ, ε, α, β Corvi. “The hand.”

14. Chitra: Spica (α Virginis). “The bright one.” The anchor star of the Lahiri ayanamsa.

15. Swati: Arcturus (α Boötis). “The independent one.”

16. Vishakha: α, β, γ, ι Librae. “The branched.”

17. Anuradha: β, δ, π Scorpii. “Following Radha.”

18. Jyeshtha: Antares (α Scorpii). “The eldest.” The heart of Scorpius.

19. Mula: λ and ν Scorpii. “The root.” The scorpion’s tail.

20. Purva Ashadha: δ and ε Sagittarii. “Former invincible.”

21. Uttara Ashadha: ζ and σ Sagittarii. “Latter invincible.”

22. Shravana: Altair (α Aquilae), β and γ Aquilae. “The hearing one.”

23. Dhanishtha: α, β, γ, δ Delphini. “The wealthiest.”

24. Shatabhisha: λ Aquarii. “The hundred healers.”

25. Purva Bhadrapada: α and β Pegasi. “Former auspicious feet.”

26. Uttara Bhadrapada: γ Pegasi and α Andromedae. “Latter auspicious feet.”

27. Revati: ζ Piscium. “The wealthy one.”

Abhijit, corresponding to Vega, is included as a 28th nakshatra in some traditions.

The twenty-seven nakshatras set against the twelve rashis

See file page for author, CC BY-SA 4.0, via Wikimedia Commons

The 28-nakshatra count, with Abhijit added between Uttara Ashadha and Shravana, is still retained in some Hindu philosophies. Traditionally, Abhijit was associated with Vega, which sits well off the ecliptic but is bright enough and culturally significant enough that some traditions kept a separate marker for it.

The bright stars are the nakshatra anchors. Aldebaran is Rohini. Regulus is Magha. Spica is Chitra. Antares is Jyeshtha. Altair is Shravana. Castor and Pollux together are Punarvasu. The Vedic tradition placed them inside the coordinate system at the same time it named them, so the same star has two names.

From the Rigveda forward

The nakshatra system is one of the oldest surviving astronomical systems in the world. It is ancient, and mostly likely predates Hinduism. The first reference to the system in the Rigveda (~1500-1200 BCE), alluding to structures that were already in early Indian culture.

The Vedanga Jyotisha is the earliest surviving dedicated astronomical text in the Indian tradition and uses the nakshatra system as its organizing framework. Its primary use was to track Sun, Moon and star movement to choose the time and date for religious events. The text documents the winter solstice at the start of Dhanishtha and the summer solstice at the midpoint of Ashlesha, and it is this information that experts use to establish the time frame it shows through precession. The events describe a sky of roughly 1400 to 1150 BCE, though the form in which the text survives is usually dated several centuries later.

At the same time, Aryabhata’s Aryabhatiya (499 CE) calculated the length of the sidereal year and the diameter of the Earth, integrating Greek influence while working within the nakshatra framework. The nakshatras are an important part of traditional Indian Hindu society: Hindu rituals and festivals, the scheduling of weddings, the compatibility matching of marriage partners, agricultural calendars, and the naming of children depend on careful calculation of nakshatra position.

The Chinese parallel

Sidereal systems are not unique to India in the ancient world. Chinese astronomers also divided the celestial equator into 28 lunar mansions (二十八宿), though their segments are unequal in width, unlike the nakshatra system’s 13°20′ equal divisions. The two systems mostly use different division points and boundary stars. One of the clearest points of overlap is the Pleiades: both systems identify this asterism as a distinct lunar mansion, Krittika in the nakshatra system and Mao (昴) in the Chinese system. Whether the two systems share a common origin or developed independently from the same observational facts remains unanswered.

Saptapadi, the seven steps taken before the sacred fire in a Hindu wedding

Symphoney Symphoney, CC BY 2.0, via Wikimedia Commons

As in many traditional systems, it is difficult to separate Vedic astronomy and Vedic astrology; both are an important part of each other, and both shaped ancient life. In a world without reliable ways to keep track of time, knowing how the stars moved was important for predicting the weather, planting crops, and marking the calendar. So too in astrology: keeping track of the timing of religious events, creating matrimonial pairings, and deciding life directions needed the stars for timing. Each was the underpinning of the other; there was never a clean distinction.

The Vedanga Jyotisha, for example, is used for ritual timing and relies on astronomy to determine the Moon’s location within the nakshatra system. This means even the earliest surviving texts have both layers present.

Modern Vedic astrology continues to use the nakshatras as its coordinate framework, as do Vedic-tradition star charts, which locate stars and planets by nakshatra position.