Kaal Sarpa Yoga, also written Kalasarpa Yoga or Kaal Sarp Dosha, is commonly defined in modern Vedic calculator practice as a birth-chart pattern in which all seven classical grahas lie between Rahu and Ketu. That short sentence hides three choices: which planets count, whether the axis boundary is inclusive, and which direction around the zodiac is being tested. This calculator makes all three visible.
The exact rule used here
- Calculate sidereal longitudes for the Sun, Moon, Mars, Mercury, Jupiter, Venus, and Saturn.
- Calculate mean Rahu and place mean Ketu 180° opposite.
- Measure the forward 180° arc from Rahu to Ketu and the opposite arc from Ketu to Rahu.
- Return a full pattern only when every one of the seven grahas lies on either complete half. A graha exactly on a node is included and flagged as a boundary case.
Why degrees matter inside one sign
Sign-only inspection can produce the wrong answer. Imagine Rahu at Aries 10° and Mars at Aries 9°. Mars is one degree before Rahu, so it belongs to the opposite half of the axis even though both labels say Aries. A second Mars at Aries 11° lies one degree after Rahu. The calculator therefore compares continuous longitudes from 0° to 360°, then shows the distance of every graha forward from Rahu.
The result also displays the count on each half. Six of seven on one side is reported as six of seven, rather than being promoted to a full pattern. Some writers use a “partial” category, but that category is not standardized enough to infer from one missing graha without an additional stated rule.
Rahu-to-Ketu and Ketu-to-Rahu orientation
The two nodes divide the zodiac into equal halves. All seven grahas can occupy the forward half from Rahu to Ketu or the reverse half from Ketu to Rahu. Sources do not use one universal label for the reverse orientation; some distinguish another yoga name while others group both orientations together. The calculator preserves the measured direction and avoids attaching a second interpretive claim.
The twelve house labels
Once a full-axis pattern is found, a familiar naming scheme uses the Whole Sign house occupied by Rahu. Ketu is opposite, six houses away. The table is a lookup, not a ranking from mild to severe.
| Rahu house | Common label | Rahu | Ketu |
|---|---|---|---|
| 1 | Ananta | 1 | 7 |
| 2 | Kulika | 2 | 8 |
| 3 | Vasuki | 3 | 9 |
| 4 | Shankhapala | 4 | 10 |
| 5 | Padma | 5 | 11 |
| 6 | Mahapadma | 6 | 12 |
| 7 | Takshaka | 7 | 1 |
| 8 | Karkotaka | 8 | 2 |
| 9 | Shankhachuda | 9 | 3 |
| 10 | Ghataka | 10 | 4 |
| 11 | Vishadhara | 11 | 5 |
| 12 | Shesha | 12 | 6 |
Worked geometric example
Suppose Rahu is at 15° Aries and Ketu at 15° Libra. The Rahu-to-Ketu half runs forward through late Aries, Taurus, Gemini, Cancer, Leo, Virgo, and the first 15° of Libra. If every classical graha lies within that span, the strict axis test is positive. A planet at 14° Aries falls just outside that half and breaks the full result even though it shares Rahu’s sign. If Aries is the Lagna, Rahu occupies the first house and the table supplies the Ananta label.
Why two calculators can disagree
A different historical UTC offset changes the birth instant. Mean and true lunar nodes are close but not identical, and moving the node can put a nearby planet on the other side of the axis. Software may also exclude a planet that shares a node’s sign but falls on the other side by degree, or it may use signs rather than exact longitude. Changing ayanamsha rotates every sidereal longitude together, so it does not change nodal-half membership; it can change the displayed signs and the Whole Sign type label near a sign boundary. Compare those settings before treating two results as contradictory.
This site uses Astronomy Engine 2.1.19 for planetary positions, a documented approximate Lahiri conversion, and mean nodes. The model is independent browser code and does not claim numerical identity with professional ephemerides. The calculator highlights any graha within 0.25° of either node so close cases can be checked with another stated method.
What the pattern does not establish
The geometry alone does not predict health, marriage, money, danger, karma, or a fixed life outcome. It also does not establish that a ritual or purchase is required. Interpretation varies widely and usually adds house lords, aspects, dignity, dashas, and other chart factors. The page keeps the reproducible position test separate from those claims.
Frequently asked questions
Do Uranus, Neptune, or Pluto count?
No. The implemented rule uses the seven classical grahas named above. Outer planets are not included in this Vedic axis test.
Does Lagna need to fall between the nodes?
No for the seven-graha presence test. Lagna is used only to convert Rahu’s sign into a Whole Sign house and select one of the twelve labels.
Can I use an unknown birth time?
A precise time is needed for Lagna and the twelve-type label. The Moon also moves quickly enough that a broad time estimate can matter near a node. The tool therefore requires a recorded time and place.
Does a positive result mean something bad will happen?
No. It means the seven calculated longitudes fit the stated axis rule. The calculator makes no event or severity prediction.