Other house systems
Besides Placidus and whole sign, Aspicio draws eight more house systems: Koch, Regiomontanus, Campanus, Alcabitius, Porphyry, equal, Meridian and Morinus. Pick one in chart settings.
A house system is a rule for cutting the sky into twelve houses, and the rules differ in what they divide. Koch and Placidus divide time: how long a degree takes to rise. Regiomontanus divides the celestial equator into equal arcs, Campanus divides the prime vertical, and Alcabitius divides the Ascendant's daily arc above the horizon. Porphyry simply splits each quarter between the angles into thirds.
Three systems ignore the horizon's tilt for the intermediate cusps. Equal houses run thirty degrees at a time from the Ascendant. Meridian and Morinus count thirty-degree steps along the equator from the Midheaven's right ascension, so their first cusp is not the Ascendant, which the chart still shows as its own point.
Near the poles some systems stop working: Placidus, Koch and Alcabitius have no answer where degrees never rise or set, and the chart falls back to whole sign and says which system it replaced. The others are defined everywhere the site casts charts.