Introduction
The previous chapter established that KP astrology goes deeper than Nakshatras. Where classical Vedic astrology stops at the Nakshatra lord, KP pushes one level further to the sub-lord — and the sub-lord is the single most important planet in the entire system. It decides outcomes. It answers yes or no.
But how do you actually find a sub-lord? Given a planet sitting at, say, 17°42' Aries, how do you know which sub it occupies and who rules it?
That's what this chapter is about. We're going to build the sub-lord table from scratch. Not memorize it — derive it. You'll understand exactly why each sub-division has the size it does, why the sequence of rulers follows the order it does, and why the total number of sub-divisions across the zodiac is 249 (not the 243 you might expect from simple multiplication).
This is a calculation-heavy chapter. There is no way around it. The sub-lord table is the backbone of KP, and you need to understand how it's constructed before you can use it confidently. Get comfortable with degree-minute-second arithmetic — it's the price of entry.
- How each Nakshatra is divided into 9 unequal sub-divisions using Vimshottari Dasha proportions
- The exact arc-span of each sub-division (with full derivations)
- Why the sub-lord sequence within a Nakshatra starts from the Nakshatra's own ruler
- Complete sub-lord tables for Ashwini and Bharani Nakshatras
- Why the zodiac has 249 sub-divisions, not 243 — the sign-boundary straddling effect
- How to look up any planet's sub-lord given its exact degree position
The Foundation: Vimshottari Dasha Proportions
You already know the Vimshottari Dasha system from Vedic astrology. Nine planets, each ruling a specific number of years, totalling 120:
| Planet | Dasha Years | Proportion of Total |
|---|---|---|
| Ketu | 7 | 7/120 |
| Venus | 20 | 20/120 |
| Sun | 6 | 6/120 |
| Moon | 10 | 10/120 |
| Mars | 7 | 7/120 |
| Rahu | 18 | 18/120 |
| Jupiter | 16 | 16/120 |
| Saturn | 19 | 19/120 |
| Mercury | 17 | 17/120 |
| Total | 120 | 120/120 |
In Vedic astrology, these proportions determine how many years each planet's Dasha lasts. In KP astrology, Krishnamurti used these same proportions for a different purpose: dividing each Nakshatra into 9 unequal parts. The logic is elegant — a planet that rules a larger Dasha period gets a proportionally larger slice of the Nakshatra arc.
Deriving the Sub-Division Spans
Each Nakshatra covers 13°20' of the zodiac. Let's convert that to a single unit to make arithmetic easier.
13°20'00" = 800 arc-minutes = 48,000 arc-seconds
Now apply each planet's proportion:
| Planet | Calculation | Arc-Span |
|---|---|---|
| Ketu | 7/120 × 13°20' | 0°46'40" |
| Venus | 20/120 × 13°20' | 2°13'20" |
| Sun | 6/120 × 13°20' | 0°40'00" |
| Moon | 10/120 × 13°20' | 1°06'40" |
| Mars | 7/120 × 13°20' | 0°46'40" |
| Rahu | 18/120 × 13°20' | 2°00'00" |
| Jupiter | 16/120 × 13°20' | 1°46'40" |
| Saturn | 19/120 × 13°20' | 2°06'40" |
| Mercury | 17/120 × 13°20' | 1°53'20" |
| Total | 120/120 × 13°20' | 13°20'00" |
Let's verify one of these manually so the method is clear.
Venus: 20/120 × 13°20'
Working in arc-seconds: 20/120 × 48,000" = 8,000"
Convert 8,000" back to degrees: 8,000 ÷ 3,600 = 2 degrees with 800" remainder. 800" ÷ 60 = 13 minutes with 20" remainder.
Result: 2°13'20"
Verification sum: 2,800 + 8,000 + 2,400 + 4,000 + 2,800 + 7,200 + 6,400 + 7,600 + 6,800 = 48,000 arc-seconds = 13°20'00". The nine sub-divisions sum to exactly one Nakshatra. No rounding, no approximation — the fit is mathematically exact.
Notice the range of sizes. The largest sub (Venus, 2°13'20") is more than three times the size of the smallest (Sun, 0°40'00"). This is not an equal division. A planet moving through one Nakshatra passes through subs of very different widths, and a planet sitting near a boundary between a small sub and a large sub needs its position known with precision.
The Sub-Lord Sequence Rule
Each Nakshatra has a planetary ruler, determined by the Vimshottari scheme. The sub-lord sequence within that Nakshatra starts from the Nakshatra ruler and then follows the standard Vimshottari order:
Ketu → Venus → Sun → Moon → Mars → Rahu → Jupiter → Saturn → Mercury
This is a cyclic sequence. Wherever you enter it, you proceed in this order, wrapping around from Mercury back to Ketu.
Here are all nine starting points:
| Nakshatra Ruler | Sub-Lord Sequence |
|---|---|
| Ketu | Ke → Ve → Su → Mo → Ma → Ra → Ju → Sa → Me |
| Venus | Ve → Su → Mo → Ma → Ra → Ju → Sa → Me → Ke |
| Sun | Su → Mo → Ma → Ra → Ju → Sa → Me → Ke → Ve |
| Moon | Mo → Ma → Ra → Ju → Sa → Me → Ke → Ve → Su |
| Mars | Ma → Ra → Ju → Sa → Me → Ke → Ve → Su → Mo |
| Rahu | Ra → Ju → Sa → Me → Ke → Ve → Su → Mo → Ma |
| Jupiter | Ju → Sa → Me → Ke → Ve → Su → Mo → Ma → Ra |
| Saturn | Sa → Me → Ke → Ve → Su → Mo → Ma → Ra → Ju |
| Mercury | Me → Ke → Ve → Su → Mo → Ma → Ra → Ju → Sa |
The pattern is always the same Vimshottari order — the only thing that changes is the starting point. Ketu-ruled Nakshatras (Ashwini, Magha, Mula) start from Ketu. Venus-ruled Nakshatras (Bharani, Purva Phalguni, Purva Ashadha) start from Venus. And so on.
This is not arbitrary. In the Vimshottari Dasha system, the sequence of Dasha lords and Bhukti lords follows the same cyclic pattern. The sub-lord division in KP is simply the spatial equivalent of the temporal Dasha sequence — the same mathematical structure applied to arc-distance instead of time.
Complete Ashwini Sub-Lord Table
Ashwini is the first Nakshatra, spanning 0°00'00" to 13°20'00" Aries. It's ruled by Ketu, so the sub-lord sequence starts from Ketu.
| Sub # | Sub-Lord | Start | End | Arc-Span |
|---|---|---|---|---|
| 1 | Ketu | 0°00'00" Ar | 0°46'40" Ar | 0°46'40" |
| 2 | Venus | 0°46'40" Ar | 3°00'00" Ar | 2°13'20" |
| 3 | Sun | 3°00'00" Ar | 3°40'00" Ar | 0°40'00" |
| 4 | Moon | 3°40'00" Ar | 4°46'40" Ar | 1°06'40" |
| 5 | Mars | 4°46'40" Ar | 5°33'20" Ar | 0°46'40" |
| 6 | Rahu | 5°33'20" Ar | 7°33'20" Ar | 2°00'00" |
| 7 | Jupiter | 7°33'20" Ar | 9°20'00" Ar | 1°46'40" |
| 8 | Saturn | 9°20'00" Ar | 11°26'40" Ar | 2°06'40" |
| 9 | Mercury | 11°26'40" Ar | 13°20'00" Ar | 1°53'20" |
Verification: The table starts at 0°00'00" and ends at 13°20'00" — exactly one Nakshatra span. Each sub's end point equals the next sub's start point. No gaps, no overlaps.
A planet at 2°15' Aries falls in the Venus sub (0°46'40" to 3°00'00"). Its star-lord is Ketu (ruler of Ashwini) and its sub-lord is Venus. In KP shorthand, you'd write: Sign lord: Mars, Star lord: Ketu, Sub lord: Venus.
A planet at 8°00' Aries falls in the Jupiter sub (7°33'20" to 9°20'00"). Sign lord: Mars, Star lord: Ketu, Sub lord: Jupiter.
Complete Bharani Sub-Lord Table
Bharani is the second Nakshatra, spanning 13°20'00" to 26°40'00" Aries. It's ruled by Venus, so the sub-lord sequence starts from Venus.
| Sub # | Sub-Lord | Start | End | Arc-Span |
|---|---|---|---|---|
| 1 | Venus | 13°20'00" Ar | 15°33'20" Ar | 2°13'20" |
| 2 | Sun | 15°33'20" Ar | 16°13'20" Ar | 0°40'00" |
| 3 | Moon | 16°13'20" Ar | 17°20'00" Ar | 1°06'40" |
| 4 | Mars | 17°20'00" Ar | 18°06'40" Ar | 0°46'40" |
| 5 | Rahu | 18°06'40" Ar | 20°06'40" Ar | 2°00'00" |
| 6 | Jupiter | 20°06'40" Ar | 21°53'20" Ar | 1°46'40" |
| 7 | Saturn | 21°53'20" Ar | 24°00'00" Ar | 2°06'40" |
| 8 | Mercury | 24°00'00" Ar | 25°53'20" Ar | 1°53'20" |
| 9 | Ketu | 25°53'20" Ar | 26°40'00" Ar | 0°46'40" |
Verification: 26°40'00" − 13°20'00" = 13°20'00". Correct.
Notice the sequence reset. Ashwini's last sub-lord was Mercury. When we cross into Bharani, we don't continue with Ketu. We restart from Venus — because Bharani is Venus-ruled. The sub-lord sequence always resets to the Nakshatra lord at each Nakshatra boundary.
The 243 vs. 249 Mystery
Here's where most students get confused — and many textbooks gloss over it.
Simple multiplication says: 27 Nakshatras × 9 sub-divisions each = 243 sub-divisions across the zodiac.
But the KP horary numbering system numbers the sub-divisions from 1 to 249. Where do the extra 6 come from?
The Answer: Sign Boundaries
The zodiac has 12 signs, each spanning 30°. The 27 Nakshatras don't align with sign boundaries — Nakshatras span 13°20', while signs span 30°. This misalignment means that some sub-divisions straddle sign boundaries. A single sub-division, computed from the Nakshatra framework, might start in one sign and end in the next.
KP treats these straddling sub-divisions as two separate entries. The portion in the first sign is one numbered slot. The portion in the second sign is another numbered slot. Same sub-lord, same Nakshatra, but split at the sign boundary.
Seeing It Happen: Krittika at the Aries-Taurus Boundary
Krittika is the third Nakshatra, spanning 26°40'00" Aries to 10°00'00" Taurus. It's ruled by the Sun, so the sub-lord sequence starts from Sun.
Let's compute where the sub-divisions fall:
| Sub # | Sub-Lord | Start | End | Arc-Span |
|---|---|---|---|---|
| 1 | Sun | 26°40'00" Ar | 27°20'00" Ar | 0°40'00" |
| 2 | Moon | 27°20'00" Ar | 28°26'40" Ar | 1°06'40" |
| 3 | Mars | 28°26'40" Ar | 29°13'20" Ar | 0°46'40" |
| 4 | Rahu | 29°13'20" Ar | 31°13'20" | 2°00'00" |
| 5 | Jupiter | 31°13'20" | 33°00'00" | 1°46'40" |
| 6 | Saturn | 33°00'00" | 35°06'40" | 2°06'40" |
| 7 | Mercury | 35°06'40" | 37°00'00" | 1°53'20" |
| 8 | Ketu | 37°00'00" | 37°46'40" | 0°46'40" |
| 9 | Venus | 37°46'40" | 40°00'00" | 2°13'20" |
Look at Sub #4 (Rahu). It starts at 29°13'20" Aries and extends to 31°13'20" — but 30°00' is the Aries-Taurus boundary. In absolute terms:
- 29°13'20" to 30°00'00" Aries = 0°46'40" — the Rahu sub portion in Aries
- 0°00'00" to 1°13'20" Taurus = 1°13'20" — the Rahu sub portion in Taurus
KP splits this into two numbered entries in the 249 table. Both have Rahu as the sub-lord, but they sit in different signs, which means different sign lords — and that matters for signification.
Counting the Splits
The zodiac has 12 sign boundaries (Aries-Taurus, Taurus-Gemini, and so on — the boundary after Pisces wraps back to Aries). Of the 243 Nakshatra-derived sub-divisions, exactly 6 straddle sign boundaries. Each straddling sub becomes 2 entries, adding 6 to the count:
243 original + 6 extra from splits = 249 numbered positions
Why 6 and not 12? Because the Nakshatra grid and the sign grid only realign every 120°. The least common multiple of one Nakshatra (13°20') and one sign (30°) is 120° — which is exactly 4 signs (4 × 30°) and exactly 9 Nakshatras (9 × 13°20'). So the whole pattern repeats three times around the 360° zodiac, with perfect Nakshatra-sign alignment at 0° Aries, 0° Leo (120°), and 0° Sagittarius (240°). Within each 120° block there are 3 sign boundaries; of these, the boundary that coincides with a Nakshatra edge falls exactly on a sub-boundary (so nothing is split), while the other 2 fall in the middle of a sub and split it. That gives 2 splits per block × 3 blocks = 6 splits across the zodiac, taking the count from 243 to 249.
Why the Split Matters
You might wonder: "It's the same sub-lord either way, so why bother splitting?" Because the sign lord changes at the boundary. A planet at 29°30' Aries has Mars as its sign lord. A planet at 0°30' Taurus has Venus as its sign lord. Even though both are in the Rahu sub of Krittika Nakshatra — and therefore have Sun as star-lord and Rahu as sub-lord — the sign lord is different. In KP's signification chain (Sign lord → Star lord → Sub lord), the sign lord contributes to the final analysis. Keeping the entries separate makes the 249 table a complete lookup: give it a number (1-249), and it tells you the sign lord, star lord, and sub-lord without ambiguity.
Natal vs. Horary: The Same Region, Two Lookup Methods
To make the 243/249 distinction concrete, let's look at the same zodiac region — around the Aries-Taurus boundary — through both lenses.
Natal chart lookup (243 logic): A planet at 29°30' Aries. You identify Krittika Nakshatra, compute the offset (2°50' into Krittika), and walk through the Sun-ruled sub table. Result: Rahu sub. The sign boundary at 30°00' doesn't affect the lookup — you simply note that the sign lord is Mars (Aries) and move on.
Horary number lookup (249 logic): A querent picks number 28 from the 249 table. This maps to the Rahu sub of Krittika in Aries (29°13'20" to 30°00'00"). If they'd picked number 29 instead, they'd get the Rahu sub of Krittika in Taurus (0°00'00" to 1°13'20"). Same Nakshatra, same sub-lord, but different KP numbers — because the sign lord changes (Mars for #28, Venus for #29), and each horary number must map to a single, unambiguous sign lord.
The sub-lord is the same in both cases (Rahu). The star lord is the same (Sun/Krittika). The difference is that horary needs the sign lord resolved unambiguously from the number alone, which is why the split exists. In natal work, you already know the planet's sign, so the 243 logic suffices.
Worked Example 1: Finding the Sub-Lord at 17°42' Aries
Step 1: Identify the Nakshatra.
Each Nakshatra spans 13°20'. The boundaries in Aries are:
- Ashwini: 0°00' to 13°20'
- Bharani: 13°20' to 26°40'
- Krittika: 26°40' to 30°00' (continues into Taurus)
17°42' falls in Bharani (13°20' to 26°40').
Step 2: Calculate the offset within the Nakshatra.
17°42'00" − 13°20'00" = 4°22'00" into Bharani.
Step 3: Walk through the Bharani sub-lord table.
Bharani is Venus-ruled. The sub-lord sequence starts from Venus.
| Sub-Lord | Arc-Span | Cumulative End |
|---|---|---|
| Venus | 2°13'20" | 2°13'20" |
| Sun | 0°40'00" | 2°53'20" |
| Moon | 1°06'40" | 4°00'00" |
| Mars | 0°46'40" | 4°46'40" |
Our offset is 4°22'00". This is greater than 4°00'00" (end of Moon sub) but less than 4°46'40" (end of Mars sub).
Result: The sub-lord is Mars.
Full signification chain for a planet at 17°42' Aries:
- Sign lord: Mars (Aries)
- Star lord: Venus (Bharani)
- Sub lord: Mars
Step 4: Verify the position within the Mars sub.
Start of Mars sub within Bharani: 13°20'00" + 4°00'00" = 17°20'00" Aries. End of Mars sub: 17°20'00" + 0°46'40" = 18°06'40" Aries.
17°42'00" falls between 17°20'00" and 18°06'40". Confirmed.
Worked Example 2: Finding the Sub-Lord at 9°55' Aries
Step 1: Identify the Nakshatra.
9°55' falls in Ashwini (0°00' to 13°20').
Step 2: Calculate the offset within the Nakshatra.
9°55'00" − 0°00'00" = 9°55'00" into Ashwini.
Step 3: Walk through the Ashwini sub-lord table.
| Sub-Lord | Arc-Span | Cumulative End |
|---|---|---|
| Ketu | 0°46'40" | 0°46'40" |
| Venus | 2°13'20" | 3°00'00" |
| Sun | 0°40'00" | 3°40'00" |
| Moon | 1°06'40" | 4°46'40" |
| Mars | 0°46'40" | 5°33'20" |
| Rahu | 2°00'00" | 7°33'20" |
| Jupiter | 1°46'40" | 9°20'00" |
| Saturn | 2°06'40" | 11°26'40" |
Our offset is 9°55'00". This is greater than 9°20'00" (end of Jupiter sub) but less than 11°26'40" (end of Saturn sub).
Result: The sub-lord is Saturn.
Full signification chain for a planet at 9°55' Aries:
- Sign lord: Mars (Aries)
- Star lord: Ketu (Ashwini)
- Sub lord: Saturn
The planet sits 0°35'00" into the Saturn sub (9°55'00" − 9°20'00" = 0°35'00"), which means it's in the first quarter of that sub — well away from the boundaries.
Worked Example 3: A Planet Near a Sign Boundary — 29°30' Aries
This example demonstrates the straddling issue.
Step 1: Identify the Nakshatra.
29°30' Aries falls in Krittika (26°40' Aries to 10°00' Taurus).
Step 2: Calculate the offset within the Nakshatra.
29°30'00" − 26°40'00" = 2°50'00" into Krittika.
Step 3: Walk through the Krittika sub-lord table.
Krittika is Sun-ruled. The sequence starts from Sun.
| Sub-Lord | Arc-Span | Cumulative End |
|---|---|---|
| Sun | 0°40'00" | 0°40'00" |
| Moon | 1°06'40" | 1°46'40" |
| Mars | 0°46'40" | 2°33'20" |
| Rahu | 2°00'00" | 4°33'20" |
Our offset is 2°50'00". This is greater than 2°33'20" (end of Mars sub) but less than 4°33'20" (end of Rahu sub).
Result: The sub-lord is Rahu.
But notice: the Rahu sub in Krittika starts at 26°40' + 2°33'20" = 29°13'20" Aries and ends at 29°13'20" + 2°00'00" = 31°13'20" — which is 1°13'20" Taurus. Our planet at 29°30' Aries is in the Aries portion of this straddling sub.
In the KP 249 table, this would be a different numbered slot than a planet at 0°30' Taurus, even though both are in the Rahu sub of Krittika.
Full signification chain:
- Sign lord: Mars (Aries — not Venus/Taurus, because we're still at 29°30' Aries)
- Star lord: Sun (Krittika)
- Sub lord: Rahu
The Complete Sub-Lord Reference: How to Use It
In practice, you don't compute sub-lords by hand every time. You use a printed or digital 249 table (also called the "KP Sub-Lord Table" or "KP Significator Table"). The next chapter provides the complete 249-entry reference table.
The table works like this:
- Find the planet's sidereal longitude (using KP ayanamsa)
- Look up the degree range that contains that longitude
- Read off the KP number, sign lord, star lord, and sub-lord
For horary (Prashna) astrology — a major application of KP — the querent simply picks a number from 1 to 249. That number maps directly to a specific degree range, which determines the Ascendant and all cusps. No birth time needed.
Common Misconceptions
Practical Application
Exercise 1: Build the Rohini Sub-Lord Table
Rohini is Moon-ruled, spanning 10°00'00" to 23°20'00" Taurus. The sub-lord sequence starts from Moon:
Mo → Ma → Ra → Ju → Sa → Me → Ke → Ve → Su
Using the arc-spans from the derivation table, fill in the start and end points for each sub. Verify that the ninth sub ends at exactly 23°20'00" Taurus.
Exercise 2: Locate the Sub-Lord
Find the sub-lord for each of these positions. Use the Ashwini or Bharani tables from this chapter, or build the relevant table yourself:
- 6°15' Aries
- 12°00' Aries
- 14°30' Aries
- 22°45' Aries
- 25°00' Aries
Answers:
6°15' Aries — Ashwini, offset 6°15'. Cumulative: Ketu 0°46'40", Venus 3°00'00", Sun 3°40'00", Moon 4°46'40", Mars 5°33'20", Rahu 7°33'20". Falls in Rahu sub (5°33'20" to 7°33'20"). Sub-lord: Rahu.
12°00' Aries — Ashwini, offset 12°00'. Cumulative through Saturn: 11°26'40". Cumulative through Mercury: 13°20'00". Falls in Mercury sub (11°26'40" to 13°20'00"). Sub-lord: Mercury.
14°30' Aries — Bharani, offset 1°10'00" (14°30' − 13°20'). Cumulative: Venus 2°13'20". Since 1°10'00" < 2°13'20", it falls in the Venus sub. Sub-lord: Venus.
22°45' Aries — Bharani, offset 9°25'00" (22°45' − 13°20'). Cumulative through Jupiter: 8°33'20". Cumulative through Saturn: 8°33'20" + 2°06'40" = 10°40'00". Since 9°25'00" < 10°40'00", falls in Saturn sub (8°33'20" to 10°40'00"). Sub-lord: Saturn.
25°00' Aries — Bharani, offset 11°40'00" (25°00' − 13°20'). Cumulative through Saturn: 10°40'00". Cumulative through Mercury: 10°40'00" + 1°53'20" = 12°33'20". Since 11°40'00" < 12°33'20", falls in Mercury sub. Sub-lord: Mercury.
Exercise 3: Sign-Boundary Identification
Krittika Nakshatra straddles the Aries-Taurus boundary at 30°00'. Which sub-division of Krittika gets split by this boundary? Compute the exact degree range of that sub in Aries and in Taurus separately.
Answer: The Rahu sub (4th sub of Krittika). It spans from 29°13'20" Aries to 1°13'20" Taurus. In Aries: 29°13'20" to 30°00'00" (span: 0°46'40"). In Taurus: 0°00'00" to 1°13'20" (span: 1°13'20"). Together: 0°46'40" + 1°13'20" = 2°00'00" — the full Rahu sub-span.
Related Concepts
- Chapter 6: From Nakshatras to Sub-Lords — Establishes why KP goes beyond the Nakshatra lord to the sub-lord level
- Chapter 8: The Complete 249 Sub-Lord Table — Full reference table with all 249 entries, sign lords, star lords, and sub-lords
- Chapter 9: The Signification Chain — How sign lord, star lord, and sub-lord combine to determine a planet's total signification
- Vimshottari Dasha (Vedic Astrology) — The temporal Dasha system whose proportions KP uses for spatial sub-divisions
Sources & References
- KP Reader I — Prof. K.S. Krishnamurti. Introduces the sub-lord concept and the 249-division framework.
- KP Reader II — Prof. K.S. Krishnamurti. Detailed tables and worked examples for sub-lord calculation.
- KP Reader Series (Volumes I-VI) — Prof. K.S. Krishnamurti. The standard reference for the 249 sub-lord entries with house cusp positions.
- Sub-Lord Speaks — K. Hariharan. Extended treatment of Nakshatra sub-divisions and their significations.
FAQ
Q: Do the sub-divisions change over time, like Dasha periods do? No. The sub-divisions are fixed divisions of the zodiac. They define permanent degree ranges — like postal codes on a map. A planet moves through them as it transits, but the boundaries themselves never move. What changes over time is which sub a moving planet occupies.
Q: Is the sub-lord the same as the Dasha Bhukti lord? No, but they share the same mathematical structure. The Dasha system divides time using Vimshottari proportions. The sub-lord system divides space (zodiacal arc) using the same proportions. A planet's sub-lord is determined by its position in the chart at a given moment — it has nothing to do with the currently running Dasha period.
Q: Why does KP use Vimshottari proportions and not some other division scheme? Because Prof. Krishnamurti found through extensive empirical testing that the Vimshottari proportions, when applied to the Nakshatra arc, produced sub-lord assignments that consistently matched real-world outcomes. The Vimshottari system had already proven reliable for Dasha timing — Krishnamurti's insight was that the same proportions work for spatial analysis too.
Q: Can the sub-lord and star-lord be the same planet? Yes. This happens whenever a planet occupies the first sub of any Nakshatra, because the first sub is always ruled by the Nakshatra lord. For example, a planet at 0°20' Aries is in Ashwini (Ketu-ruled) and in the first sub (also Ketu-ruled). Star lord = Ketu, Sub lord = Ketu.
Q: What if my software shows 243 sub-divisions instead of 249? Some software uses the 243 Nakshatra-based divisions without splitting at sign boundaries. This works fine for finding the sub-lord (the sub-lord doesn't change at a sign boundary — it's the same planet on both sides). But for KP horary (Prashna) work, you need the 249 numbering system because each number must map unambiguously to a single sign. Check your software's settings for "KP Horary" or "249 Sublords" mode.
Q: How precise does the birth time need to be for accurate sub-lord identification? As precise as possible, but especially critical for the Ascendant and fast-moving Moon. The Ascendant moves roughly 1° every 4 minutes of clock time. The smallest sub (Sun) spans only 0°40', which the Ascendant crosses in under 3 minutes of clock time. For planets, a birth time accuracy of 2-4 minutes is usually sufficient since planets move much more slowly.