A nakshatra can be discussed as a named lunar division, a group of stars, or a principal star. Those meanings are related historically but not geometrically identical. India’s Rashtriya Panchang makes the distinction visible: its explanation defines twenty-seven equal sidereal intervals, while a separate table prints dated longitudes and ecliptic latitudes for named principal stars.
What each official table records
Equal sector
Twenty-seven intervals of 13°20′ fill the full 360° nirayana circle. A panchanga’s Moon nakshatra follows the Moon’s sidereal ecliptic longitude. The start and end of a sector are mathematical boundaries.
Principal star
A selected star has one dated position on the sky: longitude around the ecliptic and latitude above or below it. The almanac’s 2026 star table lists identities and both coordinates. That position is not a sector boundary.
The U.S. Naval Observatory defines ecliptic latitude as angular distance north or south of the ecliptic. A star with large latitude can be visually far from the Moon even when their projected longitudes look close. A longitude match alone is a one-dimensional comparison.
Four examples from the 2026 star table
| Nakshatra | Equal sector | Principal star | Star’s listed longitude | Star’s ecliptic latitude |
|---|---|---|---|---|
| Asvini | 0°–13°20′ | β Arietis (Sheratan) | 10°06′38″ | +8°29′18″ |
| Chitra | 173°20′–186°40′ | α Virginis (Spica) | 179°58′54″ | −2°03′23″ |
| Svati | 186°40′–200° | α Boötis (Arcturus) | 180°22′26″ | +30°43′04″ |
| Sravana | 280°–293°20′ | α Aquilae (Altair) | 277°55′16″ | +29°18′09″ |
Star coordinates are rounded to the nearest arcsecond from the Positional Astronomy Centre’s table for 1 July 2026 at 05:29 IST; equal sector edges are derived from its separate 27-division rule. This juxtaposition is our comparison, not an almanac claim about interpretation.
Arcturus is associated with Svati in the star table, yet its listed sidereal longitude is about 6°18′ before the equal Svati interval begins. Altair is listed under Sravana, yet its projected longitude is about 2°05′ before Sravana’s equal interval. Their ecliptic latitudes are also around 30°. The star association therefore cannot be used as a shortcut for locating a Moon in one of the equal calendar sectors.
How to read a claim about a “nakshatra star”
- Ask whether it refers to a sector or an object. “Moon in Svati” in a panchanga is a sector label; “Arcturus” names a star.
- Ask for date and coordinate frame. The official star table is dated. Tropical and sidereal longitudes use different origins, and precession means a published longitude has a reference date.
- Keep latitude visible. The principal star need not sit on the ecliptic. A longitude-only alignment is not automatically a close sky conjunction.
- Keep interpretation separate. The almanac establishes names and positions. A symbolic reading belongs to a stated astrological tradition and does not follow from the coordinate table alone.
The 27-name atlas lays the star identities beside each sector. The ayanamsa guide explains how a sidereal longitude is defined.
Continue through the reference
Sources and calculation notes
- Positional Astronomy Centre, Panchang explanation ↗ — equal nakshatra division and variable ayanamsa
- Positional Astronomy Centre, principal-star table ↗ — star names, dated longitude, and latitude
- U.S. Naval Observatory, astronomical glossary ↗ — meaning of ecliptic latitude