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The Hard Part of Birth Chart Calculations Isn't the Zodiac. It's Time.

The most annoying bugs I’ve dealt with while building a birth-chart engine were not about zodiac signs. They were about time.

  • Calculating birth charts faces time complexity beyond zodiac signs
  • Daylight-saving transitions create ambiguity in local datetime input
  • Unknown birth times require representing incomplete data with null values

How I Model Aspects and Orbs in a Python Astrology Engine

I like working on aspect calculations because the astrology terminology disappears pretty quickly once you get into the code.

  • Calculate angular distance between planets' longitudes
  • Define target angles for major aspects with orbs
  • Separate aspect calculation from interpretation

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