Where the number comes from
Each of the 27 nakshatras is divided into nine subs, one per Vimshottari dasha lord, and each sub takes the same share of the nakshatra that its lord takes of the 120-year cycle. Ketu's 7 years give the narrowest sub; Venus's 20 give the widest. Twenty-seven times nine is 243; the count reaches 249 because six nakshatras straddle a sign boundary and the part either side is counted separately.
Why unequal, and why it matters
The unevenness is the point. A sub is not a tidy fraction of a degree - a Venus sub inside a Venus nakshatra runs several degrees, while a Ketu sub can be under half a degree. So the precision KP demands of a birth time is not uniform across the zodiac: a cusp landing in a wide sub is robust to a rounded birth time, and one landing in a narrow sub is not. Two charts can be equally careful and unequally reliable.
What our calculator shows
The KP chart calculator places every planet and every cusp on this grid and reports which sub each falls in - the table itself is derived, not looked up from a printed almanac.
Frequently asked
- Why 249 and not 243?
- Twenty-seven nakshatras of nine subs each is 243. Six nakshatras span a sign boundary, and KP counts the portion on each side of the boundary as its own division, which adds six.
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