What is placidus in astrology?


Key Takeaways:


  • Placidus is a popular house system in astrology that divides the ecliptic into 12 equal houses based on the birth location and time.
  • Placidus was created by 17th-century mathematician and astrologer, Placidus de Titis, and is based on the concept of the diurnal motion of the planets.
  • Placidus is accurate for northern latitudes and reflects the diurnal motion of the planets, but is not suitable for extreme latitudes where other house systems may be more appropriate.


What Is Placidus In Astrology?

Placidus is a well-known house division system in the field of astrology. It works by dividing the ecliptic into twelve unequal segments, which are determined by the Earth’s rotation and the time and location of an individual’s birth. The cusps of the houses are then calculated using the degree of the ecliptic that is intercepted by each cusp.

Placidus is a commonly used method in Western astrology for interpreting the placement of planets within the houses and gaining insights into different aspects of a person’s life.

History of Placidus

The history of Placidus can be traced back to the 17th century, when it was created by Placidus de Titis, an Italian mathematician and astronomer. Placidus is a system that is used to create astrological birth charts and it was a significant advancement in the field of astrology.

If you’re interested in learning more about the history of Placidus, you can delve into ancient astrological texts and manuscripts for detailed insights into its origins and evolution.

How Does Placidus Work?

  • Calculation: Placidus is a method that divides the ecliptic into twelve equal segments based on the time of birth and geographical location.
  • House Cusps: It determines the beginning and ending points of each house, which in turn affects the distribution of planets.
  • Time-Sensitive: The Placidus method is highly time-sensitive, making it crucial for accurate recording of birth times.
  • Popular Usage: Placidus is widely used in Western astrology for interpreting natal charts and horoscopes.

What Are the Houses in Placidus?

In Placidus astrology, the houses represent different areas of a person’s life and their unique characteristics.

First House: Signifies self-image and appearance.

Second House: Governs finances, possessions, and values.

Third House: Rules communication, intellect, and short trips.

Fourth House: Reflects home, family, and roots.

Fifth House: Relates to creativity, love affairs, and children.

Sixth House: Governs work, health, and service to others.

What Are the Houses in Placidus?

How Are the Houses Calculated in Placidus?

  1. The Placidus system divides the ecliptic into twelve houses based on the time and location of birth.
  2. It uses a specific mathematical formula to accurately calculate the cusps of these houses.
  3. The system takes into account the geographical coordinates and the time of birth to determine the house cusps.
  4. The calculations involve complex trigonometric functions to precisely derive the house divisions.
  5. Through careful consideration of the Earth’s rotation and the individual’s position, Placidus accurately calculates the house cusps.

Advantages of Using Placidus

Placidus is a popular house system in astrology that has its own unique advantages. In this section, we will discuss why many astrologers prefer to use Placidus over other house systems. We will first explore how Placidus is especially accurate for those living in Northern latitudes, and how it reflects the diurnal motion of the planets. These aspects of Placidus make it a valuable tool for astrologers seeking to gain deeper insights into their clients’ charts.

Accurate for Northern Latitudes

Placidus is a well-known astrology house system that is highly regarded for its accuracy in northern latitudes. Its unique mathematical calculations make it particularly effective in dividing the ecliptic into house cusps in these regions. For astrologers who primarily work with clients in northern latitudes, Placidus is a reliable system for creating precise natal and predictive charts. When choosing a house system, it is important to consider the geographical location for the best accuracy.

Reflects the Diurnal Motion of the Planets

Placidus is an astrology house system that accurately reflects the diurnal motion of the planets. It divides the ecliptic into unequal segments to showcase the varying speeds of the planets. This system is beneficial for depicting planetary movements throughout the day, providing insights into specific time frames for planetary influences. However, Placidus is not as precise for extreme latitudes, where other house systems such as the Equal House System may be more suitable.

Disadvantages of Using Placidus

While the Placidus house system is a popular choice among astrologers, it is not without its flaws. In this section, we will take a closer look at the disadvantages of using Placidus in astrology. We will discuss how this house system is not accurate for extreme latitudes, and how it does not reflect the diurnal motion of the planets in these regions. By understanding these limitations, we can make more informed decisions about which house system to use in our astrological practice.

Not Accurate for Extreme Latitudes

Placidus, a popular house system in astrology, may not be the most accurate for extreme latitudes. In these regions, it can distort house divisions and potentially impact chart interpretation. To ensure more precise readings in these areas, many astrologers turn to alternative house systems such as the Koch or Equal House Systems. These alternatives offer more precise calculations and interpretations for individuals residing in regions with extreme latitudes.

Does Not Reflect the Diurnal Motion of the Planets in Extreme Latitudes

Placidus, a popular house system in astrology, does not accurately represent the planetary positions throughout the day in extreme latitudes. This means that for locations near the poles, Placidus may not accurately reflect the diurnal motion of the planets. Astrologers at extreme latitudes often prefer alternative house systems like the Equal House System or Whole Sign House System, which accommodate the planetary motion more effectively.

Alternative House Systems in Astrology

In the world of astrology, there are various methods for dividing the astrological chart into different houses. One popular house system is Placidus, but there are also alternative systems that astrologers use. These include the Koch House System, Equal House System, Whole Sign House System, and Campanus House System. Each of these systems has its own unique characteristics and interpretations, providing a different perspective on the astrological chart. Let’s take a closer look at these alternative house systems and how they differ from the traditional Placidus system.

Koch House System

The Koch House System is a house division approach in astrology that divides the ecliptic into twelve equal segments. The starting point is the Ascendant, and the midheaven is not necessarily at the cusp of the tenth house. This system is favored by astrologers who prefer equal house divisions and believe it provides clarity in interpreting planetary influences on different areas of life.

Equal House System

The Equal House System is an astrological house system that divides the ecliptic into 12 equal segments, regardless of the Ascendant degree. This system is based on simplicity and is favored by astrologers who prioritize equal division of the zodiac for house placement.


  • When exploring different house systems in astrology, it’s essential to consider the unique characteristics and techniques of each system to determine the most suitable approach for your astrological practice.

Whole Sign House System

The Whole Sign House System is an ancient approach in astrology where each house is occupied by one whole sign, starting from the Ascendant. This system emphasizes the importance of the zodiac signs, as the entire sign becomes the house, influencing the interpretation of planets within it. For instance, if the Ascendant falls in Taurus, the entire 1st house is considered Taurus. This method simplifies chart interpretation, focusing on sign characteristics within each house.

Campanus House System

The Campanus House System, developed by Campanus of Novara in the 13th century, divides the space around the earth into twelve equal parts, resulting in unequal house sizes on the ecliptic. The system is considered useful for detailed analysis, especially in natal charts, offering insights into specific life areas.

Fact: The Campanus House System was widely favored during the Renaissance period for its perceived accuracy in astrological predictions.


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