every planet in your chart is standing in some sign. hellenistic astrology says that where it's standing changes how freely it gets to act. it doesn't change whether the planet is there or how loud it is. there are four positions worth knowing, and the whole scheme fits on one page.
this is the part of astrology that looks like a spreadsheet and is usually taught like one. it is worth more than that. the scheme is not a list somebody memorised; it is a picture, and once you have seen the picture you do not have to memorise anything.
the four positions
domicile is a planet in the sign it rules, in its own house. dorotheus calls such a planet self-ruled: it draws on its own resources and depends on no host. that's why the tradition reads it as the strongest place a planet can stand.
exaltation is the greek hupsoma, a word for something raised up or at its height. it isn't the planet's own house. it's the one foreign sign where the planet is received as an honoured guest rather than merely put up. it's given the good chair and listened to, but it still isn't the owner.
detriment is the sign opposite a planet's domicile. it is as far from home as it can get. the planet still works; it just works without anything of its own to draw on.
fall is the sign opposite the exaltation. the greek is tapeinoma, to lower or to deject. brennan follows robert schmidt in translating it as depression, which fits it better than the later word "fall", because the planet isn't falling anywhere. it has been put low.
the whole thing is two facts per planet
here is the part nobody says early enough. detriment is always opposite domicile. fall is always opposite exaltation. they are not two more things to learn. learn where a planet is at home and where it is exalted, look across the wheel, and you have all four.
so the table below is seven planets times two facts, not seven times four. that is fourteen things, and half of them you already half-know.
the whole scheme
 Aries |  Taurus |  Gemini |  Cancer |  Leo |  Virgo |  Libra |  Scorpio |  Sagittarius |  Capricorn |  Aquarius |  Pisces | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
 Saturn | Saturn fall in Aries | Saturn detriment in Cancer | Saturn detriment in Leo | Saturn exalted in Libra | Saturn domicile in Capricorn | Saturn domicile in Aquarius | ||||||
 Jupiter | Jupiter detriment in Gemini | Jupiter exalted in Cancer | Jupiter detriment in Virgo | Jupiter domicile in Sagittarius | Jupiter fall in Capricorn | Jupiter domicile in Pisces | ||||||
 Mars | Mars domicile in Aries | Mars detriment in Taurus | Mars fall in Cancer | Mars detriment in Libra | Mars domicile in Scorpio | Mars exalted in Capricorn | ||||||
 Sun | Sun exalted in Aries | Sun domicile in Leo | Sun fall in Libra | Sun detriment in Aquarius | ||||||||
 Venus | Venus detriment in Aries | Venus domicile in Taurus | Venus fall in Virgo | Venus domicile in Libra | Venus detriment in Scorpio | Venus exalted in Pisces | ||||||
 Mercury | Mercury domicile in Gemini | Mercury domicile in VirgoMercury exalted in Virgo | Mercury detriment in Sagittarius | Mercury detriment in PiscesMercury fall in Pisces | ||||||||
 Moon | Moon exalted in Taurus | Moon domicile in Cancer | Moon fall in Scorpio | Moon detriment in Capricorn |
Detriment always sits opposite domicile; fall always sits opposite exaltation. Every row here is one planet and every column one sign, with the planets in Chaldean order, slowest at the top and fastest at the bottom. Follow the filled marks and they fall into two arms that meet at Cancer and Leo, the Moon’s house and the Sun’s. That’s the Thema Mundi, and it’s the reason the rulerships are shaped the way they are.
Where are Uranus, Neptune and Pluto? It isn’t an oversight. This scheme was finished long before any of the three was found, and it’s already full: the two lights take one sign each, the other five take two, and all twelve are spoken for. There’s no empty seat to give them. Handing one of them a sign means taking it off somebody. Real planets, useful ones, just not what this table is made of.
where the scheme comes from
the rulerships aren't arbitrary, and they aren't ancient superstition dressed up. they come out of a diagram called the thema mundi, a mythical birth chart for the world itself. firmicus says outright that it was used as a teaching tool, which is a lovely thing to know. it was meant as an explanation, never as history.
in it, cancer is rising, and the planets sit in order out from there: moon in cancer, sun in leo, mercury in virgo, venus in libra, mars in scorpio, jupiter in sagittarius, saturn in capricorn.
the domiciles are that same sequence mirrored back the other way from the moon in cancer, in reverse zodiacal order. the two lights take the two signs of the brightest, longest part of the northern year. then each planet is given the pair of signs that sits as far from the lights as the planet does from the sun. mercury never gets more than one sign away from the sun, so it takes gemini and virgo, the signs either side. venus never gets more than two, so it takes taurus and libra. then mars, then jupiter, and finally saturn, the slowest and furthest, gets capricorn and aquarius. those are the two signs furthest from the lights, and also the coldest part of the year.
that is the whole derivation. it is a scheme built on distance and speed, and it is why the marks in the table fall into two arms that meet at cancer and leo.
ptolemy explains it in terms of heat and light and the seasons, and that reading is worth having. brennan is careful to say we should not assume it was the only thing the original author had in mind, and this site follows him in that: it is a good rationale, not a proven one.
three things it is not
it is not a verdict. a planet in fall isn't a broken planet, and it doesn't mean a bad life. dignity describes the conditions a planet is working under, not the outcome. a planet with nothing of its own to draw on still acts. it just has to borrow, improvise, or go without, and that shows up as a texture in a life rather than a score.
"essential" is a contrast word, not a compliment. it does not mean important or fundamental. it means of the sign, as opposed to accidental dignity, which is everything else about a planet's situation: which house it is in, whether it is angular, what it aspects, whether it is under the beams. a planet can be essentially dignified and accidentally wretched, and the reverse. neither one cancels the other.
four is not all of them. the tradition has five essential dignities, not two: domicile, exaltation, triplicity, bound and decan. the ones on this page are the loud ones, the ones you can see from across the room. the other three are finer-grained and they are where the tradition does most of its actual work.
the degrees, and an honest shrug
the exaltations are usually read as whole signs, and that is how this site uses them. but the sources also name a specific degree for each one. valens gives them as:
- the moon at 3° taurus
- the sun at 19° aries
- mercury at 15° virgo
- venus at 27° pisces
- mars at 28° capricorn
- jupiter at 15° cancer
- saturn at 21° libra
nobody knows why those degrees. brennan says plainly that it isn't clear what the rationale is, and the sources don't agree with each other perfectly either. people have tried to reverse-engineer them from real planetary alignments, and it has never quite worked. it's an open question, and it's more interesting left open than filled in with a guess.
so: where is your sun at home, and where is it a stranger?
you only need the sign it's in. find it in the table above, read across, and you have its condition. the same two-fact trick gives you the condition of every other planet in your chart.
source: Chris Brennan, Hellenistic Astrology: The Study of Fate and Fortune (2017), chapter 8
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