Whole Sign vs Placidus Houses — Which to Use

Whole Sign and Placidus are two popular house systems. Whole Sign assigns one sign per house; Placidus uses unequal time-based houses.

At a glance

What is the difference between Whole Sign and Placidus houses?

Whole Sign houses begin with the rising sign as the 1st house and use one whole sign per house. Placidus divides the chart based on the Sun's time above and below the horizon, producing unequal houses. Whole Sign is the oldest and clearest; Placidus adds degree-level nuance for modern Western astrologers.

  • Whole Sign = equal 30° houses aligned to the rising sign
  • Placidus = time-based, unequal houses
  • Both are valid; choice depends on interpretive style

Whole Sign vs Placidus: three key differences

Whole Sign uses one sign per house

In Whole Sign houses, the rising sign becomes the 1st house and each following sign becomes the next house. This gives each house a full 30 degrees and keeps interpretation clear.

Placidus uses time, not sign boundaries

Placidus divides the chart by the time the Sun spends above and below the horizon between rising and setting. This produces houses of unequal size and extra degree-level nuance.

Latitude changes Placidus cusps

At extreme latitudes, Placidus can produce intercepted signs or very small houses. Whole Sign and Equal houses stay stable everywhere.

Which system should you use?

Use Whole Sign for Hellenistic and sign-level clarity. Use Placidus for modern psychological astrology that needs degree-sensitive cusps. My Zodiac AI supports both.

Whole Sign vs Placidus Houses — Which to Use FAQ

Which house system is best?

There is no single best system. Hellenistic astrologers often prefer Whole Sign for its clarity. Modern psychological astrologers often use Placidus or Koch. Try the same chart in multiple systems and note which one produces clearer insights.

Will my houses change between systems?

Yes. Some planets may move to different houses, especially at extreme latitudes where Placidus produces very uneven house cusps. Whole Sign keeps the house boundaries aligned with sign boundaries.

Does My Zodiac AI use Placidus?

My Zodiac AI supports multiple house systems including Placidus, Whole Sign, Koch, Equal, and Porphyry. You can switch in the chart settings.

Which is better for high-latitude births?

Whole Sign and Equal houses are more stable at extreme latitudes. Placidus can produce intercepted signs or very small houses near the poles.

Whole Sign vs Placidus Houses — Which to Use

Whole Sign and Placidus are two popular house systems. Whole Sign assigns one sign per house; Placidus uses unequal time-based houses.
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