Cast your Vimsamsa (D20), the twentieth divisional chart of Vedic astrology, from date, time, and place of birth. The tool computes your D20 Lagna with a birth-time-confidence check, every planet’s segment, deity, D20 sign and house, and renders the chart in North or South Indian style. Uses the sidereal Lahiri ayanamsa, the same engine as our Kundli, and the BPHS modality rule.
100% private - the D20 calculation runs entirely in your browser. No birth data sent anywhere.
Supports 1900 onwards for better calculation reliability.
Birth time matters a lot here: a D20 segment is 1.5 degrees, so your D20 Lagna changes roughly every 6 minutes - about twenty times faster than the ~2-hour D1 Lagna.
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astrology| Chart / harmonic | D20 (Vimsamsa), the twentieth divisional chart |
|---|---|
| Division size | 20 equal segments of 1.5 deg (1 deg 30 min) per sign |
| Start-sign rule | By modality: movable from Aries, fixed from Sagittarius, common from Leo |
| Presiding deities | Two independent 20-name lists (BPHS Ch. 6, 17-21), one per sign parity |
| Reachable signs | All twelve, across a whole chart |
| Classically read for | Worship (BPHS Ch. 7, 1-8); spirituality/devotion = later practice |
| D20 Lagna sensitivity | ~6 min of birth time per segment (only the D24, at 1.25 deg, is finer) |
| Same-sign geometry | 20 of 240 cells, unevenly spread - no one-in-twenty rule |
| Nodes | Rahu/Ketu ALWAYS share one D20 sign (forced by the modality rule) |
| Inputs | Date, time, and place of birth |
| Engine | Meeus VSOP87 + Lahiri ayanamsa; Rahu/Ketu = mean node (same engine as Kundli) |
| Privacy | 100% client-side; no birth data leaves your browser |
The Vimsamsa - also spelled Vimshamsa - is one of the sixteen divisional charts (Shodasavarga) described in the Brihat Parashara Hora Shastra. Where the birth chart (D1) maps the whole life, each varga zooms into one domain, and the classical varga-use verse assigns the Vimsamsa to worship.
Like every varga, the D20 is a derived chart: it takes each planet’s exact sidereal longitude from the birth chart and re-maps it. Nothing new is observed in the sky. Its starting sign is fixed by the natal sign’s modality - the same shape of rule the Shodasamsa (D16) uses, but with two of the three start signs exchanged.
Each sign is divided into twenty segments of 1.5 deg. The verse rule: “From Mesh for a Movable Rasi, from Dhanu for a Fixed Rasi and from Simh for a Common Rasi: this is how the calculations of Vimshahsas... are to commence.” The count then advances one sign per segment.
| Natal sign modality | Counting starts from |
|---|---|
| Movable (Aries, Cancer, Libra, Capricorn) | Mesh (Aries) |
| Fixed (Taurus, Leo, Scorpio, Aquarius) | Dhanu (Sagittarius) |
| Common (Gemini, Virgo, Sagittarius, Pisces) | Simha (Leo) |
The twenty presiding deities are given as two independent lists - one for odd signs, one for even. The even list is not the reverse of the odd list; the verse states them separately, which is unlike the D16 (a reversed cycle) and the D24 (“reverse these from Bhima”).
| Segment | Odd sign | Even sign |
|---|---|---|
| 1 | Kali | Daya |
| 2 | Gauri | Medha |
| 3 | Jaya | Chinnashirsha |
| 4 | Lakshmi | Pishachini |
| 5 | Vijaya | Dhumavati |
| 6 | Vimala | Matangi |
| 7 | Sati | Bala |
| 8 | Tara | Bhadra |
| 9 | Jvalamukhi | Aruna |
| 10 | Shveta | Anala |
| 11 | Lalita | Pingala |
| 12 | Bagalamukhi | Chuchchuka |
| 13 | Pratyangira | Ghora |
| 14 | Shachi | Varahi |
| 15 | Raudri | Vaishnavi |
| 16 | Bhavani | Sita |
| 17 | Varada | Bhuvaneshi |
| 18 | Jaya | Bhairavi |
| 19 | Tripura | Mangala |
| 20 | Sumukhi | Aparajita |
Worked example: a planet at 9.67 deg of Gemini is in a common sign, so counting starts from Leo. 9.67 divided by 1.5 falls in the seventh segment (index 6), and six signs on from Leo is Aquarius - so its D20 sign is Aquarius, with Sati as the segment deity. Each varga in the family carries its own rule: the Chaturthamsa walks the kendras, the Chaturvimsamsa (D24) counts from a parity-selected seed, and the D20 counts from a modality-selected one.
A note on sources: one Sanskrit witness omits the third name in the odd list (“Jaya”) that its own English translation includes, while a second includes it. We ship the twenty-name reading, matching the English lineage and the corroborating witness. If the nineteen-name reading were correct, every entry from the third onward would shift by one. The disagreement is recorded rather than quietly resolved.
This is the property most often mistaken for a calculation error. Rahu and Ketu are always exactly opposite, six signs apart. Move six signs along the zodiac and the modality is the same again - Aries and Libra are both movable, Taurus and Scorpio both fixed, Gemini and Sagittarius both common. The two nodes therefore start their count from the same sign, sit at the same degree within their own signs, and land on the same segment number. The result is the same D20 sign, in every chart.
The same arithmetic applies to any two bodies six signs apart at the same degree, and it is independent of the node model. In the birth chart the nodes remain opposite as usual.
The varga-use passage of the Brihat Parashara Hora Shastra (Ch. 7, 1-8) lists what each divisional chart is consulted for. Its wording for this chart is a single word: worship. That is the classical claim, and it is the only domain claim this page makes.
Modern practice commonly widens this to spiritual practice, devotion, upasana, and progress along a religious path. That reading is later practice, not the verse’s own wording, and we label it as such. This tool computes the chart; it does not interpret it, and it makes no judgement about anyone’s religious life.
This version computes the D20 chart, houses (whole-sign from the D20 Lagna), the segment deities, and the birth-time-confidence checks. It does not interpret the chart, it does not rate devotion or spiritual attainment, and it ships no predictions and no remedies.
The Vimsamsa is the twentieth divisional chart (varga) of Vedic astrology. Each 30-deg sign is divided into twenty segments of 1 deg 30 min, and every planet is re-mapped to a new sign based on which segment it occupies. The classical varga-use verse in the Brihat Parashara Hora Shastra assigns this chart to worship. It is read alongside the birth chart (D1), not instead of it.
By Brihat Parashara Hora Shastra Ch. 6, 17-21: counting starts from Aries for a planet in a movable sign, from Sagittarius for a fixed sign, and from Leo for a common sign, then advances one sign per segment. Note that this is not the same start map as the D16, which uses Leo for fixed and Sagittarius for dual - the two are swapped. This tool applies the rule to each planet's exact sidereal longitude from the birth chart.
The Brihat Parashara Hora Shastra's varga-use verse assigns the Vimsamsa to worship - that translated word is the classical claim, and it is all this page asserts. Popular practice reads the D20 for spiritual practice, devotion, upasana and progress on a religious path; that is a later interpretive gloss on the same chart, and we name it as such rather than presenting it as the verse's own wording.
Because the rule forces it. The nodes are always exactly opposite, six signs apart. Six signs later the modality repeats, so both nodes get the same starting sign and the same segment number, and therefore the same D20 sign. This happens in every chart, and it does not depend on whether a calculator uses the mean or the true node. In the birth chart they remain opposite as usual; it is only the D20 mapping that brings them together.
The Brihat Parashara Hora Shastra gives two separate lists of twenty names, one for odd signs beginning Kali, Gauri, Jaya, and one for even signs beginning Daya, Medha, Chinnashirsha. Unlike the D16 or D24, the even list is not a reversal of the odd list - the verse states the two independently. This tool shows the deity for each planet's segment and attaches no predictive meaning to it, because the classical text assigns the names without interpretation.
The ascendant crosses one 1.5-deg segment in roughly 6 minutes of clock time at Indian latitudes, against about two hours for a D1 Lagna sign. Among the charts we publish only the Chaturvimsamsa (D24), at 1.25 deg per segment, is finer - so a birth time recorded to the nearest five or ten minutes is not precise enough to fix the D20 Lagna. This tool reports how many minutes your entered time sits from the nearest D20 Lagna boundary, and flags any planet sitting within about 0.01 deg of a segment edge.
No, and it is not evenly distributed. Because the count starts from a modality-fixed sign rather than from the natal sign, only 20 of the 240 sign-and-segment combinations map back to the starting sign: one segment for Gemini, Leo, Scorpio and Capricorn, and two for each of the other eight signs. There is no tidy one-in-twenty rule. The classical term vargottama refers to the D1/D9 correspondence, not the D20.
Both - use the North Indian (diamond) / South Indian (square) toggle above the chart; both draw the same D20 (Vimsamsa) placements. In the North Indian format the houses are fixed with the Lagna at the top and the signs rotate; in the South Indian format the signs are fixed in the grid and the ascendant is marked in its box. Pick whichever regional format is more familiar.
No. It computes the classical D20 chart and reports what traditional sources say the chart is consulted for - the varga-use verse assigns it to worship, and later practice reads it for spiritual practice and devotion. It makes no assessment of your religious life, it does not tell you what will happen to you, and it offers no remedies, mantras, gemstones, or rituals.
This page is the canonical surface for these terms: Vimsamsa, Vimshamsa, and D20 chart. They all refer to the twentieth divisional chart described above.