8 ways to divide the sky
The same birth chart yields different planetary house placements depending on which system you use. Here's when to use which.
- Placidus · 17. yüzyıl / 17th century
Placidus de Tito (1601-1668)
most common modern · time-based division · controversial at high latitudes
- Whole Sign · Antik Yunan / Ancient Greek
Hellenistic astrologers (~1st century BCE)
oldest system · each house = one sign · Hindu astrology default
- Equal · Antik / Ancient
Ancient Greek astrologers
12 equal houses · Ascendant as start · pole-resistant
- Koch · 20. yüzyıl / 20th century
Walter Koch (1895-1970)
birthplace houses · German origin · extremely latitude-sensitive
- Porphyry · Geç Antik / Late Antiquity
Porphyry of Tyre (~234-305 CE)
quadrant origin · equal trisection · mathematically simple
- Regiomontanus · Rönesans / Renaissance
Regiomontanus (Johannes Müller, 1436-1476)
medieval default · celestial equator-based · for horary
- Campanus · Orta Çağ / Medieval
Giovanni Campano (~1233-1296)
prime vertical division · mathematical elegance · medieval original
- Alcabitius · Orta Çağ İslam / Medieval Islamic
Al-Qabisi (~10th-century Arab astrologer)
Arab heritage · Hellenistic bridge · horary background