Tutorial: True Solar Time and Casting the Four Pillars by Hand

The Observatory uses True Solar Time for chart calculation: first adjust clock time based on the longitude of the birthplace, then account for the equation of time, and finally determine the Four Pillars. This tutorial is designed to manually perform calculations using this specific methodology.

• 6 Illustrated Lessons: Longitude correction → Equation of time → Solar term boundaries → Four Pillars determination → Verification
• Calculation Worksheet: One A4 page, to be filled out based on your city
• Case Studies: Three birth times, with manual calculation results matching those on the Observatory's onboarding page

Target Audience

Those who want to "understand the logic" behind their charts, and those who want to know why different software produces different results.

Delivery

Sent via email within 3 business days (PDF, including the calculation worksheet). Digital delivery, no shipping required.

Note

This focuses on methodologies and algorithms, not predictions. The choice of methodology is not a matter of right or wrong; the Observatory simply aims to clarify the criteria used.