If you have ever searched "compatibility" you have probably been served a sun-sign chart that calls Aries–Cancer "challenging" and Taurus–Virgo "harmonious". That is astrological junk food: one variable out of the dozens that matter. Two people are not compatible because their Sun signs say so. In KP they are compatible when each chart promises the relationship in its own right, when the two charts share the planets that signify marriage, and when the periods that deliver marriage run in both charts at the same time.
KP astrology synastry is the name for reading those three things together — KP astrology compatibility judged from two birth charts, not from two Sun signs. It uses nothing that a single-chart KP reading does not already use — the cuspal sub lord, the significators of the marriage houses, and Vimshottari dasha — applied to two charts side by side.
What KP Astrology Synastry Actually Checks
- Each chart's own promise — does the 7th cusp sub lord of each birth chart promise marriage at all, and of what kind?
- Shared significators — which planets signify houses 2, 7 and 11 in both charts?
- Periods that run together — when do the delivering periods of the two charts overlap?
Each check answers a question the others cannot. Two charts can share every marriage significator and still have one 7th cusp that reads as not promised. Two charts that both promise marriage may have no overlapping delivering period for years. KP states each finding as it is rather than blending them into a number.
Check 1: The 7th Cusp Sub Lord in Each Chart
This is the test with no equivalent in other compatibility systems. The 7th cusp is the marriage and partnership cusp, and its sub lord — the planet ruling the sub in which the cusp falls — decides whether the chart promises marriage. The sub lord is read at three levels: the planet itself, its star lord and its sub lord, collecting at each level the houses that planet occupies and owns. If any one of houses 2, 7 or 11 appears among them, marriage is promised — even when the adverse houses classical KP states against marriage (1, 6, 10 and 12) appear alongside; in that case the promise stands "with difficulty". Marriage reads as not promised only when the sub lord is connected to those adverse houses exclusively. The adverse houses never subtract from a promise; they annotate it.
KP writers give a second reading from the same cusp: a 7th cusp sub lord that also connects to the 5th points to a love match, and the 5th cusp sub lord confirms it — signifying 7 or 11 for a love marriage, 6 or 12 against one. Marriage and separation are read once, from the 7th cusp, with both sides' houses named; there are never two contradicting verdicts on one cusp. Because a cusp sub lord can change within minutes of birth time, each verdict is stated with how many minutes the recorded time could move before it changes.
Check 2: Shared Significators of Houses 2, 7 and 11
A KP significator of a house is graded in order of preference: a planet in the star of an occupant of the house, the occupant itself, a planet in the star of the house lord, the house lord, and planets conjoined with any of those. When a higher grade is empty the next promotes. List the significators of 2, 7 and 11 for each chart. Planets that appear on both lists are the ones whose periods can deliver marriage in both charts at once; a pair that shares none will have marriage delivered, if at all, by different planets' periods in each chart, which makes the overlap that Check 3 looks for rarer. This list is bookkeeping for Check 3, not a verdict of its own: KP has no separate rule that grades two charts by how many significators they share.
Check 3: Dasha Periods That Run Together
Every chart is running a Vimshottari Maha period with an Antar and Pratyantar nested inside it. A period delivers a promised marriage only when its Maha, Antar and Pratyantar lords jointly signify all of houses 2, 7 and 11 — each lord supplying a different house, the Maha lord at least one. Promise needs any one house; delivery needs all three. Run that test on both charts and list every period that passes, in time order. Where a delivering period in one chart overlaps a delivering period in the other, that is when a marriage between these two people can take place. The overlaps are candidate windows, not ranked ones, and inside each the transiting Sun (for a period of months) or Moon (for one of days) marks the candidate days on which its sign, star and sub lords are all among the period lords. Dasha cannot deliver what the 7th cusp has not promised, and transit corroborates a period; it never decides.
What KP Synastry Does Not Use
KP does not count from one Moon nakshatra to another, add up points on a 36-mark scale, consult planetary friendship tables to grade two running dashas, or draw aspect grids with orbs between the two charts. Those devices belong to other traditions and to Western synastry, and mixing them into a KP reading gives it a false precision it cannot back. KP judges by the cusp sub lord, the significators and the periods, and its verdict for each chart is promised or not promised — with annotations, never a percentage or a compatibility score.
Reading Compatibility on KP Astrology Pro
The Compatibility reading reads two birth charts together: add the other person as a second profile and choose Compatibility when you start a new reading. You can also ask the marriage question from each birth chart: Ask a Question reads the 7th cusp of the chart you enter, states the houses at each level, the verdict, the delivering periods in time order and the candidate days inside them, and the birth-time margin behind the verdict. A question uses one reading (from ₹99), and readings never expire. Run it for both charts and lay the delivering periods side by side — where they overlap is the window Check 3 describes. For the whole marriage picture from one chart, the marriage area of the Deep Dive reading judges every marriage rule the writing gives on that one chart, with the delivering periods over three years.
Compare with Other Methods
- KP Synastry vs Ashtakoota — Where They Disagree — how the cusp-and-period reading differs from the traditional 36-point matching, and why a pair can pass one and fail the other.
Want the marriage question judged from your own chart? Ask a Question — one reading per question — or see pricing for reading packs.
Frequently Asked Questions
Sun-sign compatibility compares one variable and generalises. KP synastry asks what each birth chart promises from its 7th cusp sub lord, which planets signify the marriage houses 2, 7 and 11 in both charts, and when the Vimshottari periods of both charts deliver marriage at the same time. It is a reading of two charts, not a score.
No. Nakshatra-count matching and the 36-point system belong to a different tradition. KP reads compatibility from cusp sub lords, significators and dasha periods, and its verdict is promised or not promised — never a points total or a percentage.
It reads marriage and separation once, from the 7th cusp. A 7th cusp sub lord that signifies any of 2, 7 or 11 promises marriage; if it also touches 1, 6, 10 or 12 the promise stands 'with difficulty'; it reads as not promised only when it is connected to those adverse houses exclusively. KP does not turn that into a probability of divorce.
Houses 2, 7 and 11 promise marriage; 1, 6, 10 and 12 are the adverse houses classical KP states against it; a connection to the 5th marks a love match rather than an arranged one. Each chart's 7th cusp sub lord is read at three levels — the planet, its star lord, its sub lord — collecting the houses occupied and owned at each.
Yes. The Compatibility reading reads two birth charts together; add the other person as a second profile and choose Compatibility. Each partner can also ask the marriage question from their own birth chart with Ask a Question (one reading per question, from ₹99; readings never expire); the two readings give each chart's verdict and its delivering periods, and where those periods overlap is the window for a marriage between them.
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