Everything Western astrology can calculate for you
650+ techniques from Ptolemy to Ebertin: natal, progressions, directions, synastry, fixed stars and Hellenistic lots. Every calculation cites its primary source.
Cited from Ptolemy and Lilly
Every calculation links to a primary source: Ptolemy's Tetrabiblos, William Lilly's Christian Astrology, Vettius Valens' Anthology, the works of Robson and Brady.
NASA JPL precision
Swiss Ephemeris (DE431 / NASA JPL) under the hood — the same astronomy NASA uses, no rounding, no approximations.
Hellenistic + Modern schools
From 2nd-century profections and Zodiacal Releasing to Dane Rudhyar's Sabian symbols and Ebertin midpoints. Full spectrum of traditions.
12 sections of Western astrology
Open a section to see the techniques inside, each with a one-line description and source reference.
12 zodiac signs
Tropical zodiac: 12 equal signs of 30°, anchored to the equinox points.
10 planets + nodes
Personal, social and transpersonal planets + North/South lunar nodes.
12 houses
Life domains: from body (1st) to subconscious (12th).
ASC / MC / DSC / IC
Four angular points — primary axes of personal identity.
Elements
Fire, Earth, Air, Water — energetic balance of the chart.
Modalities
Cardinal, Fixed, Mutable — modes of action.
Polarities
Yang (fire + air) and Yin (earth + water) — active vs receptive balance.
Hemispheres
Planet distribution across chart halves — private vs public emphasis.
Chart shape (Marc Edmund Jones)
7 types: Bowl, Bucket, Locomotive, Seesaw, Splay, Splash, Bundle — pattern of planet distribution.
Chart signature
Strongest sign by weighted planet score — the chart's primary note.
Focal planet
The Bucket-chart 'handle' or a singleton — primary energy channel.
Sources: Ptolemy Tetrabiblos · Lilly Christian Astrology · Marc Edmund Jones "How To Learn Astrology" · Liz Greene · Stephen Arroyo
Major aspects
Conjunction, sextile, square, trine, opposition — Ptolemy's five.
Minor aspects
Semi-sextile, quintile, septile, novile, biquintile and others.
Aspect patterns
Stellium, T-square, Grand Trine, Grand Cross, Yod, Kite.
T-Square
Two oppositions + square — the chart's primary tension.
Grand Trine
Three trines in one element — easy talent.
Yod (Finger of God)
Two quincunxes + sextile — karmic mission point.
Kite
Grand Trine + opposition to a fourth planet — talent focus.
Orbs
Allowable deviation from exact angle — adjustable by school.
Mystic Rectangle
2 oppositions + 2 trines + 2 sextiles — harmonious stable figure.
Cradle
3 sextiles + 2 trines — supportive, protecting configuration.
Stellium
3+ planets in one sign or house — theme concentration.
13 aspect figures
Full catalog: T-square, Yod, Kite, Mystic Rect., Cradle, Talent Triangle and more.
Sources: Robert Hand "Horoscope Symbols" · Bil Tierney "Aspect Patterns" · Donna Cunningham
Placidus
Most popular time-based system — recommended for latitudes ±60°.
Koch
Placidus alternative, popular in Germany.
Whole Sign
Most ancient system: one sign = one house. Revived by Hellenists.
Equal House
Equal 30° houses from the Ascendant.
Porphyrius
Simple trisection of quadrants — ancient Greek system.
Regiomontanus
Division by celestial equator. Medieval astrology standard.
Campanus
First vertical divided into 12 equal parts.
Morinus
Latitude-independent — useful for polar locations.
Topocentric (Polich-Page)
Modern Placidus alternative — more accurate at high latitudes.
Alcabitius
Medieval Arabic time-based system — parallel to Placidus.
Meridian / Axial
Equator-based division — useful for astrolabes and asteroid researchers.
Sources: Ptolemy Tetrabiblos III · Lilly Christian Astrology · Ralph Holden "The Elements of House Division"
Jupiter–Pluto transits
Long-term life cycles and generational themes.
Mercury–Mars transits
Daily and weekly moods, tactics.
Lunar transits
Emotional rhythms, short-term peaks.
Eclipses
Solar and lunar eclipses — pivot points of 6-month cycles.
Retrograde periods
Complete retrograde calendar for all planets 1891–2099.
Stations
Moments planets stop — peak influence points.
Declinations
Parallels and contraparallels — north–south aspects.
Out-of-bounds planets
Planets beyond ±23°27' — non-standard expressions.
Mundane transits
Transits to national charts per Nick Campion — politics and world events.
Ingress charts
Charts at Sun's entry into cardinal signs — seasonal forecast.
Sources: Robert Hand "Planets in Transit" · Howard Sasportas "The Gods of Change" · Nick Campion "Book of World Horoscopes"
Secondary progressions
Day after birth = year of life. The most popular technique.
Tertiary progressions
Lunar month = year of life.
Minor progressions
Month after birth = year of life.
Solar Arc
All planets shift by the Sun's daily motion amount.
Directions
Direct and converse symbolic advancements.
Primary directions
Ptolemy's technique — directions through celestial arcs.
Progressed lunation cycle
8-phase cycle of progressed Moon and Sun.
Converse directions
Progressions into the past — analysis of karmic premises of the current phase.
Sources: Robert Blaschke "Progressions" · Bernadette Brady "Predictive Astrology"
Solar return
Sun's return — chart for the year from birthday.
Lunar return
Moon's return — chart for ~28 days.
Saturn return
~29.5 years — maturation turning points.
Jupiter return
~12 years — expansion cycles.
Venus return
~225 days — relationship cycles.
Mercury return
~88 days — communication cycles.
Demi-returns
Returns to opposition — cycle midpoints.
Demi-solar
Half-year solar return (180° from birthday) — annual cycle re-evaluation point.
Anniversary returns
Returns at 5/10/15/20/25 years — multiple-cycle anchors.
Sources: Mary Shea "Planets in Solar Returns" · Celeste Teal "Lunar Nodes & Returns"
Classical synastry
Aspects between one chart's planets and another's.
Midpoint composite
Chart of longitude midpoints — single chart of the couple.
Relational composite
Combined chart anchored to a location.
Davison chart
Chart for the midpoint of dates and birthplaces.
Destiny chart
Time-space midpoint techniques.
Relationship houses
5th, 7th, 8th — love, marriage, intimacy.
Couple's lunar phase
Moon phase in the composite sets the relationship's energy.
Parallels in synastry
Declination overlap between two charts — an invisible but powerful link.
Declination aspects
OoB planets in synastry — where the partner pulls you beyond your usual limits.
Sources: Stephen Arroyo "Relationships & Life Cycles" · Robert Hand "Planets in Composite" · John Townley
Profections
Age-based house and its lord — primary theme of the year.
Firdaria
Persian system of planetary life periods.
Zodiacal Releasing
Lots of Fortune and Spirit — career and spiritual period technique.
Time lords
Planetary rulers of periods in Hellenistic astrology.
Circumambulations
Ptolemy's circular movement through the bounds.
Profected year
Current age-sign and its ruler.
Planetary periods
Lesser, middle and greater planetary periods.
Ascensions
Ptolemy's method: each sign rises in its own time — basis of primary directions.
Prenatal syzygy
New or full moon preceding birth — karmic context of the chart.
Sources: Vettius Valens Anthology · Dorotheus Carmen Astrologicum · Chris Brennan "Hellenistic Astrology"
4 Royal Stars
Aldebaran, Regulus, Antares, Fomalhaut — Watchers of the four corners.
63 Robson stars
Classical star catalog per Vivian Robson 'Fixed Stars and Constellations' (1923).
12 Behenian
Agrippa's magical stars for talismans — 'Three Books of Occult Philosophy' II.32.
39 Brilliant Stars (Brady)
Heliacal risings per Bernadette Brady 'Brilliant Stars' (2015) — stars of birth.
25 Hellenistic
Stars from Tetrabiblos I.9 — Ptolemy's classification of planetary natures.
Parans
Stars at the angles when planets rise.
Heliacal rising
First appearance of a star after conjunction with the Sun.
Star parallels
Stars at the same declination as natal planets.
28 Lunar mansions (Western)
Agrippa II.46 and Picatrix — Arabic tradition, distinct from Vedic's 27 nakshatras.
Sources: Vivian Robson "Fixed Stars" · Bernadette Brady "Brilliant Stars" · Ptolemy Tetrabiblos I.9 · Agrippa "Three Books of Occult Philosophy" II.46 · Picatrix
Chiron
Wounded Healer — point of deep wound and gift.
Ceres
Motherhood, nurture, nourishment, cycles.
Pallas
Wisdom, strategy, pattern recognition.
Juno
Marriage, fidelity, partnership.
Vesta
Sacred flame, devotion to a calling.
Lilith
Black Moon — shadow feminine.
Eros & Psyche
Sexual attraction and soul connection.
Centaurs
Chiron, Nessus, Pholus, Chariklo — boundary bodies.
Pholus, Nessus, Chariklo
'Lesser centaurs' — toxic relationships, genetic themes, feminine wisdom.
Dark Moon (Selena)
Hypothetical Earth satellite — point of purification and karmic grace.
Sources: Demetra George "Asteroid Goddesses" (1986) · Melanie Reinhart "Chiron and the Healing Journey"
14 Arabic Lots
14 key lots implemented: of Fortune, Spirit, Love, Death, Sickness, Marriage, Children, Career and others.
Lot of Fortune
Body, health, luck — primary lot.
Lot of Spirit
Career, action, reputation.
Sect (diurnal / nocturnal)
Day or night chart determines benefic planets.
Triplicity rulers
Element rulers per Dorotheus: day / night / participating.
Ptolemy's bounds
Each sign divided into 5 unequal parts by planet.
Decans
Sign divided into 3 parts of 10° — each with its own planetary ruler.
Essential dignities
Domicile, exaltation, triplicity, bounds, face — 5-point scoring.
Antiscia
Mirror points across the Cancer–Capricorn axis.
Dodecatemoria
12-fold subdivision of each sign — Dorotheus of Sidon, micro-reading of a degree.
Monomoiriai
Single-degree analysis by Chaldean order — a ruler for each of the 360 degrees.
Decanic faces
Ruler of a 'face' (10°) — weakest essential dignity (+1 point).
Sources: Ptolemy Tetrabiblos · Dorotheus Carmen · Vettius Valens Anthology · Antiochus · Hephaistio
360 Sabian symbols
One symbol per ecliptic degree — Marc Edmund Jones (1925) + Dane Rudhyar (1973).
106 midpoints (Ebertin)
Complete Cosmobiology — each pair of planets yields a point read through a third.
Harmonics
5th, 7th, 9th harmonic charts — John Addey.
Vertex
Electric point of fated encounters.
Part of Fortune
Modern interpretation of the Hellenistic lot.
East Point / Anti-Vertex
Additional angular point of the chart.
Cosmic Cross
AC-DC and MC-IC axes as four directions of personality.
Planetary hours
Chaldean order: each hour of the day is ruled by a planet.
5 critical degrees
0°/13°/26° cardinal, 8-9°/21-22° fixed, 4°/17° mutable — peak points.
Black Moon Lilith
Lunar orbit's apogee — shadow feminine, karmic independence.
Uranian (hypothetical)
Cupido, Hades, Zeus, Kronos, Apollon, Admetos, Vulkanus, Poseidon — Hamburg School.
Sources: Marc Edmund Jones (1953) · Dane Rudhyar "An Astrological Mandala" (1973) · Reinhold Ebertin "Combination of Stellar Influences"
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