What is a Cusp?
A cusp is the starting point of a house — the exact degree of the zodiac at which one house ends and the next begins. Where much of classical Vedic practice treats a whole sign as a house, Krishnamurti Paddhati (KP) treats the house as a span of space with a precise beginning, measured in degrees, minutes and seconds. That beginning is the cusp, and in KP it carries more weight than the house as a block.
The first cusp is the Lagna or Ascendant — the degree of the ecliptic rising on the eastern horizon at the moment of birth. The tenth cusp is the Midheaven. The remaining ten cusps fall between them according to the house division method in use. In Stellar Transit the twelve cusps are listed with their sign, star lord and sub lord, because those three pieces of information are what the tradition actually reads.
Why KP Uses Placidus Cusps
KP adopts the Placidus system of house division, a time-based method that divides the semi-arc each degree of the ecliptic takes to travel from the horizon to the meridian. Because it depends on latitude and on the obliquity of the ecliptic, Placidus produces houses of unequal size. At tropical latitudes the twelve houses are fairly even; at higher latitudes some houses stretch across more than one sign while others compress into a few degrees.
The reasoning behind the choice is that a house in KP is a region of space anchored to the local horizon and meridian, not a label attached to a sign. Two people born in the same city minutes apart share the same planetary sign positions but have different cusps, and KP holds that this difference is what separates their charts. Whole-sign or equal-house schemes cannot make that distinction with the same resolution, which is why KP moved away from them.
Cusps are calculated on the sidereal zodiac using the KP (Krishnamurti) ayanamsha. Choosing a different ayanamsha shifts every cusp by the difference between the two values, which can move a cuspal sub lord from one planet to another. You can compare values on the ayanamsha calculator.
The Cuspal Sub Lord
The KP zodiac is layered. The 360 degrees are first divided into twelve signs, each with a sign lord. The same 360 degrees are independently divided into 27 nakshatras of 13 degrees 20 minutes each, and every nakshatra has a star lord following the Vimshottari sequence. Each nakshatra is then subdivided into nine subs, in the same Vimshottari order and in proportion to the dasha year-lengths — Ketu 7, Venus 20, Sun 6, Moon 10, Mars 7, Rahu 18, Jupiter 16, Saturn 19, Mercury 17, totalling 120. The sub is therefore unequal in size: a Venus sub is far wider than a Sun sub.
Every cusp falls in a sign, in a nakshatra and within one of that nakshatra's nine subs. The lord of that sub is the cuspal sub lord, and KP treats it as the deciding factor for the matter of that house. The principle, in Krishnamurti's own framing, is that the sign lord shows the broad field, the star lord shows the source of the result, and the sub lord shows whether the matter will be granted or denied. Because subs are narrow, a cuspal sub lord can change within a few minutes of birth time — one reason KP practitioners insist on accurate birth data and often use rectification.
Reading the Twelve Cusps
- 1st cusp — the person, body, general disposition and overall vitality.
- 2nd cusp — accumulated wealth, family, speech and food.
- 3rd cusp — courage, siblings, short journeys and communication.
- 4th cusp — mother, home, land, vehicles and formal education.
- 5th cusp — children, speculation, creative output and past merit.
- 6th cusp — illness, debt, service, opposition and competitors.
- 7th cusp — marriage, partnership, contracts and the other party in any dealing.
- 8th cusp — longevity, obstacles, legacies and matters held in common.
- 9th cusp — long journeys, higher learning, fortune and belief.
- 10th cusp — profession, status, authority and public standing.
- 11th cusp — gains, fulfilment of desire, friends and elder siblings.
- 12th cusp — expenditure, separation, foreign residence and confinement.
A typical KP judgement pairs the cusp with its significators rather than reading it alone. The cuspal sub lord is examined first; the planets signifying the house are then ranked; and the timing is left to the dasha sequence. The cusp table gives the positions, and the planet table supplies the star and sub lords needed alongside it.
Frequently Asked Questions
Why does KP use cusps instead of whole-sign houses?
Because KP defines a house as a measured span anchored to the local horizon, not as a sign. Cusps give a precise degree for each house beginning, which allows the sub lord of that degree to be identified. Whole-sign houses have no single defining degree, so the cuspal sub lord method could not be applied to them.
Can a house cover two signs in the Placidus system?
Yes. Placidus houses are unequal, so a house can begin in one sign and end in another, and at higher latitudes a sign may be intercepted — fully contained inside a house without ruling any cusp. This is expected behaviour and not an error in the calculation.
How much does an inaccurate birth time affect the cusps?
Considerably. The cusps move roughly one degree per four minutes of clock time, so a few minutes of error can move the Ascendant into a different sub and change the cuspal sub lord. In Stellar Transit the sub lord drives the conclusion, so practitioners treat an uncertain birth time as something to rectify before judgement.
Do the cusps depend on the ayanamsha used?
The Placidus cusps are computed in the tropical frame and then converted to sidereal by subtracting the ayanamsha, so every cusp shifts by that amount. KP uses the Krishnamurti ayanamsha; using Lahiri or another value shifts all twelve cusps by the difference and may alter sub lords near a boundary. Full charts are available in the Kundali section.