House System
How to choose and change the house system.
A house system is the method used to divide the horoscope circle into 12 houses. Different house systems place the house boundaries (cusps) at different degrees, which can change which house a planet falls in. HOSHIDOU supports two house systems.
Supported House Systems
Placidus
Placidus is the most widely used house system in modern Western astrology worldwide. It uses a time-based division method, which means houses can vary significantly in size depending on birth latitude and time.
Because the vast majority of books and online resources assume Placidus, it is the easiest system to cross-reference with other materials. Placidus is the default setting in HOSHIDOU.
Whole Sign
Whole Sign is the oldest house system in the astrological tradition. Each house occupies exactly one complete zodiac sign (30 degrees), making every house the same size.
It has seen a strong resurgence in popularity alongside growing interest in traditional astrology. Because house boundaries align perfectly with sign boundaries, it is straightforward to learn and interpret.
How to Change
To change the house system, open Settings, then select the House System option and choose either Placidus or Whole Sign. Your selection takes effect immediately on all charts.
What It Affects
The house system setting applies to every chart type in HOSHIDOU - Single Wheel, Triple Wheel, synastry, and composite. Changing the system shifts house cusp positions, which may reassign planets to different houses and update the house cusp table.