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Có hơn 10 cách khác nhau để chia bầu trời thành 12 nhà. Mỗi hệ thống sử dụng toán học và triết lý khác nhau. Đây là hướng dẫn hoàn chỉnh giúp bạn hiểu chúng.

10

Hệ thống nhà

2000+

Năm lịch sử

Placidus

Phổ biến nhất

Whole Sign

Hệ thống lâu đời nhất

So sánh nhanh

Hệ thốngAn toàn cựcNhà đều
#1Placidus
#2Whole Sign
#3Koch
#4Topocentric
#5Equal House
#6Regiomontanus
#7Campanus
#8Porphyry
#9Alcabitius
#10Morinus

Hướng dẫn chi tiết

Placidus

#1

Placidus de Titis (1603)

Divide TIME - how long each degree takes to travel from horizon to midheaven

Each house cusp is the degree that has completed 1/3, 2/3 of its semi-arc journey from rising to culminating.

Ưu điểm

  • Most popular worldwide (default on astro.com, most apps)
  • Time-based - relates to the actual journey of degrees across the sky
  • Best for timing techniques (transits, progressions)

Nhược điểm

  • FAILS at extreme latitudes (above ~66°)
  • House sizes can be very unequal
  • Complex iterative calculation
Modern WesternDefault for most softwareTiming astrology

Whole Sign

#2

Hellenistic astrologers (200 TCN)

An toàn cựcNhà đều

Each zodiac sign IS a house - the simplest possible system

The sign containing your Ascendant becomes the 1st house. The next sign is the 2nd house, and so on. No math required beyond finding the Ascendant.

Ưu điểm

  • Simplest to calculate and understand
  • Works at ALL latitudes including polar regions
  • Oldest documented system (Hellenistic tradition)

Nhược điểm

  • Ascendant may not be at cusp of 1st house
  • MC may not be at cusp of 10th house
  • Less precise for timing techniques
HellenisticVedic/JyotishTraditional revival

Koch

#3

Walter Koch (1962)

Divide the path the Ascendant degree has traveled since rising

Trisects the Ascendant's own journey from horizon to midheaven. The "birthplace" system.

Ưu điểm

  • Popular in German-speaking countries
  • Birth-location specific (meaningful symbolism)
  • MC and ASC at natural cusps

Nhược điểm

  • Fails at extreme latitudes (like Placidus)
  • Can produce extreme house size variations
  • Less theoretical justification than Placidus
GermanEbertin schoolCosmobiology

Topocentric

#4

Wendel Polich & A.P. Nelson Page (1961)

Modern refinement of Placidus accounting for exact observer position on Earth's surface

Like Placidus but adjusts for the observer being on the Earth's surface, not at its center.

Ưu điểm

  • Most astronomically precise system
  • Works at higher latitudes than pure Placidus
  • Best for very precise timing

Nhược điểm

  • Very similar to Placidus (minimal practical difference)
  • Still fails at extreme polar latitudes
  • Complex calculation
Modern technicalPolich-Page schoolRectification specialists

Equal House

#5

Hellenistic/Medieval astrologers (100)

An toàn cựcNhà đều

Divide the zodiac into 12 equal 30° segments starting from the Ascendant

Start at the Ascendant degree, then each house cusp is exactly 30° further. All houses are exactly 30°.

Ưu điểm

  • Simple to calculate (just add 30° each time)
  • Works at all latitudes
  • All houses equal size (30°)

Nhược điểm

  • MC not aligned with 10th house cusp
  • Less traditional than Whole Sign or Placidus
  • Ignores latitude-based factors in house division
Modern simplifiedSome British astrologers

Regiomontanus

#6

Johannes Müller (Regiomontanus) (1475)

An toàn cực

Divide the celestial equator into 30° segments, then project via great circles

Trisects the celestial equator, then uses great circles through the north and south points to find ecliptic cusps.

Ưu điểm

  • Works at all latitudes
  • Historically important (Renaissance to 18th century)
  • Good for horary astrology (William Lilly used this)

Nhược điểm

  • Less intuitive than time-based systems
  • Superseded by Placidus in popularity
  • Intermediate cusps can feel arbitrary
RenaissanceHorary (traditional)European 15th-18th century

Campanus

#7

Johannes Campanus (Giovanni Campano) (1260)

An toàn cực

Divide the prime vertical into 30° segments, then project onto the ecliptic

Uses great circles through the north and south points of the horizon. Space-based rather than time-based.

Ưu điểm

  • Works at all latitudes including poles
  • Space-based (relates to local environment)
  • Philosophically elegant (divides the "what is above" from "what is below")

Nhược điểm

  • House sizes can be very unequal
  • Less intuitive than time-based systems
  • Not widely used today
MedievalMundane astrologyLocal space work

Porphyry

#8

Porphyry of Tyre (270)

An toàn cực

Trisect each quadrant of the chart evenly along the ecliptic

Take the four angles (ASC, IC, DSC, MC) and divide each quadrant into three equal parts. Simple trisection.

Ưu điểm

  • Simpler than Placidus or Koch
  • Works at all latitudes
  • MC and IC at their natural house cusps

Nhược điểm

  • Less nuanced than time-based systems
  • Can produce very unequal houses if quadrants are unequal
  • Not widely used in modern practice
Ancient GreekMedievalHistorical study

Alcabitius

#9

Al-Qabisi (Alcabitius) (960)

Trisect the semi-arcs projected onto the celestial equator

Divides the time it takes for a point to rise to culminate, projected onto the equator. Arabic tradition.

Ưu điểm

  • Time-based like Placidus but simpler calculation
  • Important in medieval tradition
  • MC and ASC at natural cusps

Nhược điểm

  • Fails at extreme latitudes (like Placidus)
  • Less common in modern practice
  • Requires understanding of semi-arc concept
Medieval EuropeanIslamic/ArabicTraditional

Morinus

#10

Jean-Baptiste Morin (Morinus) (1661)

An toàn cực

Divide the celestial equator equally, project to ecliptic without latitude adjustment

Like Regiomontanus but ignores geographic latitude entirely. Pure equator-to-ecliptic projection.

Ưu điểm

  • Works at all latitudes including poles
  • Simple calculation (no iteration needed)
  • Location-independent (universal)

Nhược điểm

  • Ignores geographic latitude (some see this as a flaw)
  • Ascendant may not align with 1st house cusp
  • Rarely used in modern practice
French classicalTheoreticalMorin followers

Câu hỏi thường gặp

Which house system is correct?

None is objectively "correct" - they're all valid mathematical models. Different systems divide the sky differently, like different ways to slice a pie. The "best" one depends on your astrological tradition and what you're trying to learn about a chart.

Why does my Rising sign stay the same but planet houses change?

All systems agree on the Ascendant (Rising sign) and Midheaven - these are fixed astronomical points. What changes is where the intermediate house boundaries fall, which can shift planets between houses.

Which should I use as a beginner?

Whole Sign is the simplest to understand - each sign equals one house. Placidus is the most popular if you want to match what most apps show. Try both and see which resonates with your experience.

Why do some systems fail at polar latitudes?

Systems like Placidus divide TIME (how long each degree takes to travel across the sky). Near the poles, some degrees never rise or set, making time-based division mathematically impossible. Space-based systems like Whole Sign or Campanus don't have this problem.

Can I change my house system?

Yes! In most astrology apps, you can select your preferred house system. Your planets don't move - only the house boundaries change, which may shift which houses some planets fall in.

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