Calculate House Cusps

Calculating house cusps involves determining the zodiac sign and degree at the beginning of each house in the birth chart. The cusps mark the dividing lines between the twelve houses and play a crucial role in astrology for interpreting planetary placements and their influences on different areas of life. Here's how you can calculate the house cusps:

1.      Ascertain Birth Details: Gather the exact time (including hours and minutes), date, and place of birth of the individual.

2.      Determine Local Mean Time (LMT): Adjust the birth time from Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC) to Local Mean Time (LMT) for the place of birth. Each location has its own time zone offset from GMT/UTC.

3.      Calculate Sidereal Time (ST): Use the LMT to calculate the Sidereal Time (ST) at the birthplace. Sidereal Time represents the position of the vernal equinox and is necessary for house cusp calculation.

4.      Ascendant (Lagna): The Ascendant (Lagna) marks the beginning of the first house. Calculate the Ascendant degree using astrological software or tables, incorporating the Sidereal Time, and the individual's birth location.

5.      House Size: Each house spans 30 degrees of the zodiac. Measure the size of each house in degrees, starting from the Ascendant. For example, if the Ascendant is at 10° Aries, the first house spans from 0° Aries to 30° Aries.

6.      Calculate Cusps: Proceed counterclockwise from the Ascendant, adding 30 degrees for each subsequent house. If a house spans more than one zodiac sign, adjust accordingly. For example, if the first house spans from 0° Aries to 25° Taurus, the second house will start at 25° Taurus.

7.      Identify Sign and Degree: Once you've calculated the cusps for each house, determine the zodiac sign and degree at the beginning of each house. Each house cusp represents the entry point into a different area of life.

8.      Midheaven (MC): The Midheaven marks the beginning of the tenth house. Calculate its position using the Sidereal Time and other relevant factors, similar to how you calculated the Ascendant.

By accurately calculating the house cusps, you create the foundation for interpreting planetary placements in the birth chart and providing insights into various aspects of the individual's life.