True Solar Time Basics Clock Time vs. Solar Reality True solar time uses the Sun's actual position, while standard clock time assumes uniform motion. Correction usually includes longitude adjustment (about 4 minutes per degree from the standard meridian) and the equation of time. In China, standard time is based on 120°E, so longitude differences are added or subtracted before applying the equation of time. The correction is most important when a birth time is near a day or hour boundary. Use true solar time for boundary cases and professional accuracy. It refines the hour and sometimes the day pillar. Where It Changes Readings Career & Wealth Small time shifts can change the hour pillar, which may alter timing cues for career or wealth phases. Love & Relationship Relationship indicators tied to hour or day can change when the birth time is near midnight. Personality Personality structure remains, but expression timing may shift when corrections change the hour pillar. Health Use accurate time to reduce interpretation noise when health themes depend on the hour pillar. Notes on Time Correction How to Calculate True Solar Time Collect Longitude: Get the birth location longitude to compute the correction to the standard meridian. Apply Equation of Time: Add or subtract the equation of time after longitude correction to get true solar time. Re-check Boundaries: If the corrected time crosses midnight or a two-hour boundary, update the day or hour pillar. True Solar Time FAQs Q: When is true solar time required? A: It is most relevant for professional-grade readings and for births close to day or hour boundaries. Q: Does true solar time change the Day Master? A: It can, but only if the correction crosses midnight. Q: Is longitude correction enough? A: No. The equation of time also matters because the Sun's apparent motion is not uniform. Related Tools Timing Theory Overview: return to the full timing map → Da Yun Start Time: use the next timing layer for comparison → Early vs Late Zi Hour: compare another timing correction or cycle rule → TIMEACTOR AI Bazi - Explore your chart structure and key signals in minutes. →