Riven Calculator

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Reviewed by: David Chen, Professional Astrologer

Expert in Hellenistic and Modern Astrological Techniques

The Astrology House Calculator is a specialized tool designed to help you determine the exact boundaries of the 12 astrological houses in your birth chart. By using the Equal House system, this calculator provides precise degree placements based on your Ascendant, helping you understand which areas of life are influenced by specific planetary transits.

Astrology House Calculator

Enter the exact degree of your Ascendant (0 is 0° Aries).

Calculation Result:

Astrology House Calculator Formula:

For the Equal House System:

House (n) = (Ascendant + (n - 1) × 30°) mod 360°

Variables:

  • Ascendant Degree: The exact mathematical point on the eastern horizon at the time of birth.
  • Latitude: Geographical coordinate (North/South) of the birth location.
  • Longitude: Geographical coordinate (East/West) of the birth location.
  • n: The house number (1 through 12).

Related Calculators:

What is Astrology House Calculator?

An astrology house calculator is a mathematical tool used to divide the 360-degree zodiac circle into twelve distinct sections known as “houses.” Each house represents a specific sphere of human experience, such as career, relationships, or personal identity. While there are many house systems (Placidus, Koch, Whole Sign), the Equal House system remains one of the oldest and most reliable methods.

By inputting your Ascendant degree, this calculator ensures that every house is exactly 30 degrees wide, starting from the Rising Sign. This provides a balanced view of your astrological blueprint and is particularly favored by practitioners of Vedic and Hellenistic astrology.

How to Calculate Astrology House Calculator (Example):

  1. Determine your Ascendant (e.g., 10° Leo = 130° total).
  2. The 1st House starts at your Ascendant degree (130°).
  3. For the 2nd House, add 30° to the 1st House cusp (130° + 30° = 160°).
  4. Repeat for all 12 houses, subtracting 360° if the total exceeds 360°.
  5. Map these degrees back to the Zodiac Signs (e.g., 160° is 10° Virgo).

Frequently Asked Questions (FAQ):

What is the most accurate house system? There is no single “correct” system; Placidus is popular in the West, while Whole Sign and Equal House are preferred for ancient techniques.

Why do I need my birth time for this calculator? The houses rotate every 4 minutes; without an exact time, your Ascendant and house placements will be incorrect.

Can I use this for locations near the poles? Yes! One advantage of the Equal House system is that it works perfectly at high latitudes where Placidus often fails.

Does this calculator support the Whole Sign system? This version uses the Equal House logic. For Whole Sign, the 1st house begins at 0° of your rising sign.

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