How the Ṣoḍaśāṁśa is constructed
Each sign is divided into sixteen parts of 1°52'30" each, and the sixteen divisions run across twelve signs and then four more.
- Movable signs
- Counting begins from Aries.
- Fixed signs
- Counting begins from Leo.
- Dual signs
- Counting begins from Sagittarius.
- The wrap
- Because sixteen divisions are spread over twelve signs, the 13th through 16th divisions repeat the first four signs of the sequence. Each division is under two minutes of arc wide, which makes this chart unusually sensitive to birth-time error.
What "vehicle" actually means in this chart
A vāhana is what carries you. In the older sense that includes the animal, the cart, the ship — the means by which a person moves through the world and the comfort or discomfort of that movement. The modern reading of "car" is a narrowing, not a translation.
Read widely, the D-16 is the chart of conveyance and of the pleasures that come with it: travel, the quality of one's daily movement, and by extension the material comforts that surround a life in motion. Its connection to happiness is direct — a person whose D-16 is afflicted is often someone for whom travel, commuting and the machinery of daily life are a persistent source of friction.
This also explains the weight it carries in the strength schemes. A graha comfortably placed here is a graha whose results arrive smoothly; one badly placed produces the same results with constant mechanical trouble around them.
How to read the D-16
Read the 4th house of the D-16 first — vehicles and comforts belong to the 4th, and this is the 4th within the chart that specialises in them. Then the D-16 Lagna and Venus, the natural significator of conveyances and of comfort generally.
Malefics in the 4th of the D-16, or a badly placed 4th lord, is the classical signature for trouble with vehicles: accidents, breakdowns, disputes over ownership. Read it alongside the Chaturthāṁśa, which handles the fixed side of the same 4th-house territory.
Because each division is under two minutes wide, treat a D-16 built on an approximate birth time with real caution. This is one of the charts where rectification is not optional.
The Ṣoḍaśāṁśa at a glance
Every figure here is specific to this division. The Vimśopaka rows give the share of the twenty-point strength score the Ṣoḍaśāṁśa carries in each classical scheme — a blank means the division is not counted in that scheme at all.
| D16 | |
|---|---|
| Divisions per sign | 16 |
| Arc of one division | 1°52'30" |
| Divisional Lagna changes every | about 7 minutes |
| Vimśopaka weight · Ṣaḍvarga (6) | — |
| Vimśopaka weight · Saptavarga (7) | — |
| Vimśopaka weight · Daśavarga (10) | 1½ |
| Vimśopaka weight · Ṣoḍaśavarga (16) | 2 |
Counted in 2 of the four schemes. The more schemes a division appears in, the more the tradition treats it as load-bearing rather than specialist.
How accurate your birth time needs to be for the Ṣoḍaśāṁśa
The Rāśi Lagna moves through a whole sign in roughly two hours, which is why the birth chart tolerates an approximate time. This division cuts each sign into 16, so the D16 Lagna moves to a new sign about 7 minutes — and the planets near a boundary shift with it. If your recorded time is uncertain by more than that, treat the D16 Lagna and any house-based conclusion drawn from it as provisional, and rectify the time against dated life events before relying on it. Sign placements of the slower grahas stay stable much longer than the Lagna does.
How this is computed
Positions come from an astronomical ephemeris, converted to the sidereal zodiac on the Lahiri (Citrapakṣa) ayanāṁśa and computed by our own Parāśara engine — no pre-written results, and no language model anywhere near a number. Where the classical texts disagree, this page names the convention we follow instead of quietly picking one.