D108 Chart Calculator - Ashtottaramsa Chart
A free ashtottaramsa (D108) chart calculator — 108 parts of 16' 40" per sign, found by taking the dwadasamsa of each body's navamsa position.
The ashtottaramsa is the D108: 108 parts in every sign, each 16 minutes 40 seconds of arc, thirty degrees divided by 108. By default this calculator builds it in two steps: it takes each body's navamsa (D9) position first, then the dwadasamsa (D12) of that navamsa position. Nine times twelve is 108, so the two steps together land on a grid of exactly that fineness.
The order of the two steps matters: taken the other way round, as the navamsa of the dwadasamsa, the same longitude can land in a different sign. What this calculator draws is the dwadasamsa of the navamsa, and each row of the table below follows that order.
The D108 stands outside the sixteen divisions of Brihat Parashara Hora Shastra; it has no share of the Vimsopaka points either. P.V.R. Narasimha Rao's textbook mentions it once, as a higher chart outside that book's scope. This page therefore assigns the D108 no area of life: it explains how the chart is computed and stops there.
Nine bodies, two steps each
Each body takes two rows: its navamsa sign with the degree it has reached inside that navamsa, then the 2 deg 30' slice of that degree, counted from the navamsa sign. The datum: a fabricated sample chart, 1 January 1990 at noon IST in Chennai, not a real birth.
| # | Body and step | Result |
|---|---|---|
| 1 | Sun, navamsa | Virgo 1 deg 47' |
| 2 | Sun, D12 of that | part 1: Virgo |
| 3 | Moon, navamsa | Scorpio 28 deg 11' |
| 4 | Moon, D12 of that | part 12: Libra |
| 5 | Mars, navamsa | Scorpio 25 deg 08' |
| 6 | Mars, D12 of that | part 11: Virgo |
| 7 | Mercury, navamsa | Capricorn 18 deg 07' |
| 8 | Mercury, D12 of that | part 8: Leo |
| 9 | Jupiter, navamsa | Capricorn 13 deg 06' |
| 10 | Jupiter, D12 of that | part 6: Gemini |
| 11 | Venus, navamsa | Aries 22 deg 46' |
| 12 | Venus, D12 of that | part 10: Capricorn |
| 13 | Saturn, navamsa | Libra 17 deg 15' |
| 14 | Saturn, D12 of that | part 7: Aries |
| 15 | Rahu, navamsa | Leo 12 deg 32' |
| 16 | Rahu, D12 of that | part 6: Capricorn |
| 17 | Ketu, navamsa | Aquarius 12 deg 32' |
| 18 | Ketu, D12 of that | part 6: Cancer |
Saturn shows the method: its navamsa is Libra at 17 deg 15', which is in the seventh 2 deg 30' slice, so the count runs seven signs from Libra and stops at Aries. Rahu and Ketu hold the same navamsa degree in opposite signs, Leo and Aquarius, so their D108 signs, Capricorn and Cancer, are opposite too.
How to read the result
Pick D-108_ashtottaramsa from a cell's selector. It is second from the end of the list, after D-81_nava_navamsa and before D-144_dwadas_dwadasamsa. With parts this narrow the D108 ascendant changes sign after a very small advance of the rising degree, so the As mark in this cell depends heavily on the birth time entered.
To check a placement, set a D-9_navamsa cell beside it and hover the same body there: the navamsa sign and degree it shows are the inputs to the second step. Find which 2 deg 30' slice that degree falls in and step that many signs on from the navamsa sign; the result is the sign the D108 cell shows. The degree in the D108 hover is 108 times the rasi degree, with whole thirties taken off.
Each D108 sign depends on where a body sits inside its navamsa, so bodies sharing a navamsa sign can still part company here: Mercury and Jupiter both have Capricorn navamsas in the sample, at 18 deg 07' and 13 deg 06', and go to Leo and Gemini. Amber pada tags in the D108 cell are recomputed from these D108 placements as well.
Key terms
- D-108_ashtottaramsa
- The selector key for this chart, in the engine's own spelling; by default it draws the dwadasamsa-of-navamsa composite.
- Composite varga
- A division made by applying one varga rule to the output of another; the D108 here is the D12 rule run on D9 positions.
- Navamsa degree
- The arc a body has run through inside its navamsa, rescaled to a 0 to 30 range; this is the figure the D12 step of the D108 slices.
- 16' 40" part
- One D108 part, thirty degrees over 108. A navamsa of 3 deg 20' holds twelve of them, one for each dwadasamsa slice.
- Order of composition
- Dwadasamsa of the navamsa is the order used here; reversing the two steps can move the same longitude into a different sign.
- Parivritti
- A cyclic family of counting schemes; one variant cuts the sign straight into 108 parts. It is available in the engine but is not the default drawn here.
Two known rules, combined
No new table to learn: the navamsa's element-seeded count first, then the dwadasamsa's count from the sign itself.
108 parts of 16' 40"
Nine navamsas per sign, each holding twelve dwadasamsa slices, give the 108 equal parts of this chart.
Computation, no reading
Outside BPHS's sixteen divisions and without Vimsopaka weight, the D108 is shown here as a calculation, with no signification attached.
Common questions
What is an ashtottaramsa chart?
The D108: each sign in 108 parts of 16' 40". By default this calculator finds a body's D108 sign by taking its navamsa first, then the dwadasamsa of that navamsa position.
Is the D108 the navamsa of the dwadasamsa or the dwadasamsa of the navamsa?
Here, the dwadasamsa of the navamsa. The order matters, because reversing it can change the result: for the sample Sun, D12 then D9 gives Aries, while D9 then D12, the order used here, gives Virgo.
Is the D108 one of Parashara's sixteen divisions?
No. It is not in the BPHS list of sixteen and carries no Vimsopaka weight, so this page gives the computation and no signification for it.
Why do Rahu and Ketu land in opposite signs in the D108?
They stand at the same degree in opposite rasi signs. Opposite signs start their navamsa runs from opposite signs, so the nodes' navamsas are opposite and their navamsa degrees equal; the D12 step then moves both the same number of signs, and they stay opposite. In the sample they reach Capricorn and Cancer.
Do I need my exact birth time?
Yes. Each part is 16' 40" of arc, a ninth of the width of a dwadasamsa part, so the D108 lagna changes sign with very small shifts in the time entered. Among the bodies, the Moon needs about half an hour to cross a part and the Sun several hours.