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technique
The machinery. How things are actually calculated, the historical apparatus, and the Part 2 layer. 166 pages.
abu ma'shar
Ninth-century Persian astrologer whose synthesis shaped everything that followed in the west.
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adam elenbaas
Founder of Nightlight Astrology, and my own teacher. Traditional technique, modern heart.
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alan white
Astrologer and teacher. Notes to come. I want to get this one right rather than fast.
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alexandria
Where Greek philosophy, Egyptian temple practice and Mesopotamian omen-lore collided.
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an astrology of causes
The competing model: the planets physically act on the world. Ptolemy's position.
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angular, succedent, cadent
The three grades of house strength, and why a planet on an angle shouts.
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animism
The older assumption underneath astrology: that the world is alive and can be addressed, not just measured.
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annual profections
One sign per year of life. The simplest of the Hellenistic timing techniques, and the best first one.
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antiochus of athens
The source of the aspect doctrine and the conditions of bonification and maltreatment.
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applying and separating
Whether an aspect is still forming or already past. Timing lives here.
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ascensional times
Some signs take longer to rise than others. Ancient timing techniques are built on the difference.
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astro.com
Astrodienst. Free accurate charts, and the reference most people can actually reach.
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astrocartography
The chart mapped onto the globe. Where your planets are angular, geographically.
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astrological determinism
Four positions on how much is fixed, and why practitioners have never agreed.
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astrology as divination
Reading the sky as a sign rather than a cause. The older of the two explanations.
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austin coppock
Traditional astrologer and writer, known for work on the decans.
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aversion
Two signs that cannot see each other. The absence of aspect is itself information.
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balbillus
Thrasyllus' son, court astrologer to three emperors, and a source for early timing techniques.
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benefics and malefics
Jupiter and Venus help. Mars and Saturn cut. Neither is a verdict.
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benjamin dykes
Translator of an enormous body of medieval Latin and Arabic astrology.
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berossus
The Babylonian priest who set up a school on Kos and carried Babylonian astrology west.
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bonification
The conditions under which a benefic genuinely helps a planet. Part 2 material.
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cazimi
A planet in the heart of the Sun. The narrow band where invisibility becomes privilege.
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chani nicholas
Astrologer and writer whose horoscopes reach an enormous audience. Not my lineage, but probably how a lot of people arrive here.
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chinese astrology
A separate system entirely, with twelve animals, five elements, and a sixty-year cycle.
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chiron
Discovered in 1977 and adopted fast. The wound, the teacher, or a small icy body, depending who you ask.
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chris brennan
Astrologer whose 2017 book is the standard modern reference for Hellenistic practice.
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claudius ptolemy
The most famous name in ancient astrology, and the least representative of it.
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combustion
Close enough to the Sun to be burned by it. The harmful end of invisibility.
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cosmobiology
Reinhold Ebertin's stripped-down method: midpoints and hard aspects, no houses.
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critodemus
Early and shadowy figure associated with some of the oldest timing material.
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dane rudhyar
The root of humanistic astrology, and the figure who turned the chart into a psychological map.
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dashas
Vedic planetary periods. A time-lord system running in parallel to the Hellenistic ones.
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declination and parallels
Distance north or south of the celestial equator. A whole second aspect grid.
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demetra george
Astrologer and translator; one of the central figures in the modern Hellenistic revival.
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derived houses
Counting a new first house from any place, to read one topic from another's point of view.
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detriment and fall
A planet in the sign opposite its home or its exaltation. Working uphill.
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dispositor
Follow the ruler, then follow ITS ruler. The chain that ends somewhere.
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domicile
A planet in the sign it rules. The home team on its home field, and the cleanest form of dignity.
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dorian gieseler greenbaum
Scholar and translator; her work on the Lots and on daimon is foundational.
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dorotheus of sidon
First-century poet-astrologer whose Carmen is the backbone of the practical tradition.
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egyptian astrology
The decans, the temple zodiacs, and the other half of the Hellenistic inheritance.
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electional astrology
Choosing a moment to begin something, by picking a favourable chart for it.
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enclosure
A planet hemmed in on both sides. Who is doing the hemming decides whether it helps.
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essential and accidental dignity
Two different questions: is the planet well placed by sign, and is it well placed by everything else.
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essential dignity
How well a planet is placed in the sign it is in. The oldest scoring system in astrology, and the one most often misread.
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evolutionary astrology
Reads the chart as the record of a soul's trajectory. Nodes and Pluto do the heavy lifting.
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exaltation
A planet honoured as a guest. Strong but not at home, and the difference matters.
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financial astrology
Markets, cycles, and the branch that gets taken seriously by people who take nothing seriously.
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firmicus maternus
The fourth-century Latin compiler who preserved a great deal that would otherwise be lost.
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fixed stars
The named stars behind the zodiac. Older than the signs, and still used.
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good and bad places
The tradition ranked the twelve houses. Some are advantageous, some are not.
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harmonics
Dividing the circle by any number and reading what appears. A modern research method.
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hellenistic astrology
The Greek-language tradition, roughly 100 BCE to 600 CE. The source this site reads from.
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hephaestio of thebes
Fifth-century compiler who quotes Dorotheus and Ptolemy at length, and often our only access to them.
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hermes trismegistus
The legendary author Hellenistic astrology credits with its founding texts.
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horary astrology
Answering a question from the chart of the moment it was asked.
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hypatia
Alexandrian mathematician and philosopher, and the reason to ask who else was practising.
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james holden
Prolific translator whose editions made many primary texts available in English.
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jeff green
The other founding voice of evolutionary astrology, with a Pluto-centred method.
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john frawley
Traditional astrologer and teacher, associated with the modern horary revival.
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kelly surtees
Traditional astrologer and teacher, and a frequent voice on the podcast circuit.
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kepler college
The degree program that taught a generation to take the history of astrology seriously.
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lilith
Black Moon Lilith. A calculated point, several competing definitions, and a lot of feeling.
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liz greene
Jungian analyst and astrologer; the most influential voice in psychological astrology.
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lord of the year
The planet ruling the profected sign. For twelve months, it runs the show.
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maltreatment
The conditions under which a malefic genuinely damages a planet. Part 2 material.
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marcus manilius
First-century Latin poet whose Astronomica is the earliest surviving complete treatment.
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masculine and feminine
A binary Hellenistic astrology applies to planets and signs alike. What it meant then, and how to read it now.
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masha'allah
Eighth-century Persian Jewish astrologer, central to the transmission into Arabic.
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mayan astrology
The Tzolk'in calendar and its day-signs. Mesoamerican, and not derived from the old world at all.
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medieval astrology
The Persian, Arabic and Latin centuries between the Hellenistic tradition and the modern one.
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mesopotamian astrology
Where it starts. Omens, the earliest birth charts, and a sky read as a message.
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midpoints
The halfway point between two planets, treated as a sensitive spot.
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modern psychological astrology
The twentieth-century branch that reads the chart as a map of the psyche. Where most people start.
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morning star and evening star
Whether a planet rises before the Sun or sets after it, and why Hellenistic astrology cared.
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mundane astrology
The astrology of nations, weather and collective events rather than individuals.
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nechepso and petosiris
The pseudonymous king and priest behind the oldest layer of the technical material.
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neptune
Dissolution and dream. The trans-Saturnian that erases the edges.
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obliquity of the ecliptic
The tilt between the ecliptic and the equator. It causes the seasons, and the signs' unequal rising times.
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olympiodorus
Sixth-century Alexandrian philosopher whose lectures on Paulus survive as a commentary.
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overcoming
The planet in the superior position wins the exchange. Position, not just distance.
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paulus of alexandria
Fourth-century author of a compact introduction that became a standard teaching text.
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planetary hours
Each hour of the day ruled by a planet, in the Chaldean order. Ancient, practical, and easy to use.
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planetary speed and stations
Fast, slow, stationary. A planet's speed is part of its condition.
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pluto
Depth and irreversibility. The trans-Saturnian of what does not return the same.
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porphyry of tyre
Neoplatonist philosopher whose Introduction preserves a great deal of Antiochus.
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precession of the equinoxes
The slow wobble that pulled the tropical and sidereal zodiacs apart.
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primary motion
The whole sky turning east to west once a day. This is what moves the ascendant, and why birth time matters.
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project hindsight
The 1990s translation project that put Hellenistic astrology back in practitioners' hands.
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quadrant house systems
Placidus, Koch, and the rest. What they do differently, and why this site does not use them.
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reception
When a planet sits in a place another planet rules, the ruler is disposed to help it.
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rectification
Working backwards from events to find an unknown birth time. Slow, and worth it.
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relocation charts
Recasting a birth chart for somewhere you have moved to. Same moment, different horizon.
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rhetorius of egypt
The last of the Hellenistic authors, and a crucial summariser of everything before him.
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richard tarnas
Cultural historian whose Cosmos and Psyche argues the case for archetypal cosmology.
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robert hand
One of the three founders of Project Hindsight, and the editor behind much of the translated corpus.
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robert schmidt
The translator whose work made the Hellenistic corpus readable in English.
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robert zoller
The third of the Project Hindsight founders; focused on the Latin and medieval material.
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rodden ratings
How reliable is that birth time? AA to DD, and why it matters more than people think.
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ruler of the ascendant
The chart ruler, given its Hellenistic name and its full job description.
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rulership
Every sign has a planet in charge of it. Following that planet is the oldest move in the book.
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secondary motion
The planets' own slower drift west to east through the signs. This is what a transit is made of.
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secondary progressions
A day for a year. The chart moved forward symbolically rather than actually.
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sect
Day chart or night chart. One line splits every birth chart in the world into two piles.
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serapio of alexandria
Author of a surviving set of definitions of the configurations.
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sidereal time
Time measured against the stars rather than the sun. What a chart is actually calculated from.
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sign-based aspects
Aspects counted whole sign to whole sign, before degrees enter the picture.
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solar arc directions
Every point advanced by the Sun's yearly motion. Blunt, and often uncannily exact.
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solar fire
The chart software I use. Every date and position on this site comes out of it.
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solar returns
The chart for the moment the Sun returns to its natal degree. One year at a time.
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stephen arroyo
Writer whose books on the elements and on chart interpretation shaped a generation of readers.
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steven forrest
Astrologer and teacher in the evolutionary tradition, known for a warm and non-deterministic style.
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synastry
Comparing two charts. Whose planets land where in whose houses.
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synodic cycles
Two planets meeting, separating and meeting again. The rhythm underneath the news.
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the angles
Ascendant, Midheaven, Descendant, IC. The four pivots the chart turns on.
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the asteroids
Ceres, Pallas, Juno, Vesta and thousands more. Modern, optional, and popular.
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the astrology podcast
Chris Brennan's long-running show, and the best free archive of serious astrological discussion.
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the bounds
Unequal subdivisions of each sign, each with a planetary ruler. Egyptian bounds are the standard set.
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the celestial equator
Earth's equator projected onto the sky. The other great circle, and where declination is measured from.
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the celestial sphere
The sky as a globe around the earth. The model every chart is drawn from.
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the chaldean order
Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon. Slowest to fastest, and the reason for the days of the week.
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the chart ruler
The planet that rules your rising sign. If one planet gets the first word, it is this one.
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the composite chart
One chart built from the midpoints of two. The relationship as its own entity.
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the conjunction
Two planets in the same place. The loudest aspect, and the first one to learn.
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the decans
Thirty-six ten-degree divisions, Egyptian in origin and older than the zodiac itself.
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the ecliptic
The Sun's apparent path. The line the whole zodiac is measured along.
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the ephemeris
The table of where the planets are. Everything else is built on top of it.
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the horary revival
The late-twentieth-century return of question-charts, largely from William Lilly's text.
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the joys of the planets
Each planet has a house it's glad to be in, and the joys explain where the house meanings came from.
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the lot of fortune
The most-used lot, covering body, health and livelihood. It's also the anchor of several timing techniques.
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the lot of spirit
Fortune's counterpart. Mind, action, career, and what a person does deliberately.
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the lots
Calculated points, the Lot of Fortune chief among them. Ancient, and largely dropped by moderns.
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the lunar nodes
Where the Moon's path crosses the Sun's. Eclipses happen here.
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the midheaven
The highest point. Career, reputation, and the part of life that is publicly visible.
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the nakshatras
Twenty-seven lunar mansions. The layer of Vedic astrology with no western equivalent.
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the opposition
Two planets across the chart from each other. Facing off, and aware of it.
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the sect light
The Sun by day, the Moon by night. The single most important body in the chart.
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the seven traditional planets
Everything visible to the naked eye. The complete cast of Hellenistic astrology.
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the sextile
Sixty degrees. Cooperation that has to be taken up rather than given.
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the sidereal zodiac
Measured against the fixed stars rather than the seasons. The other answer to where Aries starts.
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the square
Ninety degrees. Friction between signs that share nothing.
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the thema mundi
The chart of the world's birth. A teaching diagram that explains why the rulerships are what they are.
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the traditional revival
How Hellenistic astrology came back: a 1992 conference, three translators, and thirty years of work.
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the trans-saturnians
Uranus, Neptune, Pluto. Real, useful, and not part of the traditional system. Here's how this site handles that.
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the trine
A hundred and twenty degrees. Same element and easy agreement, sometimes too easy.
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the two motions
The sky moves two ways at once, in opposite directions. Almost every confusion about charts starts here.
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thrasyllus
First-century astrologer to the emperor Tiberius, and a crucial early systematiser.
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time-lord techniques
The family of methods that ask not what a chart says, but WHEN it says it.
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traditional vs modern astrology
Two different practices sharing a vocabulary. What actually separates them.
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transmission of astrology
How Hellenistic astrology moved from Greek to Persian to Arabic to Latin, and what changed at each step.
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triplicity
Each element has three rulers, and which one is in charge depends on sect.
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triplicity rulers of the sect light
A three-part division of the life, read from the rulers of the sect light's element.
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tropical vs sidereal zodiacs
Two ways to define where Aries starts. The oldest live argument in astrology.
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twelfth-parts
Each sign divided into twelve. A magnifying glass on a single degree.
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under the beams
A planet too close to the Sun to be seen. Present, working, invisible.
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uranian astrology
The Hamburg School. Midpoints, hypothetical planets, and a very different toolkit.
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uranus
Rupture and revolution. The trans-Saturnian that breaks the inherited pattern.
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vedic astrology
Jyotisha. The Indian tradition, with a sidereal zodiac, an unbroken lineage, and a different set of tools.
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vettius valens
Second-century astrologer whose Anthology is the most practical text to survive.
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void of course moon
The Moon making no more aspects before it changes sign. Traditionally, a bad time to begin.
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walter mercado
The astrologer who reached more people than anyone in the Spanish-speaking world, in a cape, with total sincerity.
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whole sign houses
One sign, one house. The oldest house system, and the one this site uses.
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william lilly
Seventeenth-century English astrologer whose Christian Astrology is the horary source text.
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zodiacal melothesia
The body mapped onto the zodiac, Aries at the head and Pisces at the feet.
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zodiacal releasing
A time-lord technique run from the Lots. Chapters of a life, with visible peaks.
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