People bring the same birth date and hour yet get two different charts and blame the software. The gap is usually not the date but casting from clock time without converting birthplace longitude and the day's equation of time.
What This Question Is Really Asking
True solar time asks how far the moment the sun is overhead at your birthplace differs from what your wall clock showed. Without that correction the Life Palace lands in the wrong position and the whole chart follows.
The Underlying Logic
Clock time is the uniform mean time a whole time zone shares, but it does not mean the sun is truly overhead at your birthplace.
Longitude correction follows the birthplace's offset from the time zone's central meridian, about four minutes per degree, earlier to the east.
The equation of time arises from the elliptical orbit and the tilted axis and swings within plus or minus about fifteen minutes over the year.
During daylight saving the clock was set forward an hour; set it back to standard before converting, and handle the 11 p.m. midnight boundary carefully.
A Step-by-Step Way to Read It
- Record the clock birth time and the birthplace longitude and latitude
- Check whether daylight saving applied that year; if so, subtract an hour first
- Compute the longitude correction from the birthplace's offset to the zone central meridian
- Look up the equation of time for the birth day and add it to the longitude correction
- Convert the corrected time into a shichen, watching the late and early midnight boundary
- Cast from the corrected true solar time and compare it with the clock-time chart
Three Common Mistakes
Mistake 1: Casting straight from clock time without longitude and equation-of-time correction
Mistake 2: Assuming one time zone means no longitude conversion matters
Mistake 3: Ignoring daylight saving or the clock change and adding or missing an hour
Back to Your Own Chart
Spending a few minutes on true solar time before casting lays the chart's foundation. Once longitude, the equation of time and daylight saving are handled, the chart from your birthday is truly yours.
Reading Order
- Cast the natal chart first and locate the palaces and major stars tied to true solar time and birthplace longitude before judging anything
- Open the triple-direction of those palaces and count the auspicious, malefic and assistant stars separately
- Check where the natal Four Transformations land to set the chart's baseline tone
- Read the decade-limit transformations to see whether the true solar time and birthplace longitude line is activated in this stage
- Then read the annual transformations and the year's palace to pin down this year's trigger and timing
- Layer natal, decade and year before concluding, then decide how to act rather than labeling good or bad