What Is True Solar Time? Why Birth Time Is Adjusted in Saju
In Saju, birth time is not a small detail. Even two people born on the same day can have different hour pillars, and that changes the way the chart is interpreted. This is why some readings check true solar time instead of relying only on the clock time written on a birth record.
What true solar time means
True solar time is time calculated from the actual movement of the sun. Standard time is a social agreement based on a time zone, while true solar time reflects the sun's position at the birth place. In Korea, standard time is based on 135 degrees east longitude, but many birth places are west of that line, so clock time and solar position do not always match exactly.
Why it matters in Saju
The hour pillar is decided by the time of birth. If the recorded time is close to the boundary between two hour branches, a true solar time correction can move the chart into a different hour pillar. That can affect the interpretation of personality, relationships, useful elements, and timing.
True solar time is especially worth checking when the birth time is near a branch boundary, when the birth place is far from the standard meridian, or when the chart feels noticeably out of step with the person's actual life pattern.
Do all charts need correction?
Not always. If the birth time sits clearly in the middle of an hour branch, the correction may not change the chart. But when the time is near a boundary, confirming true solar time can make the reading more precise.
What to prepare
To calculate it properly, you need the solar or lunar birth date, the exact birth time, the birth place, and whether daylight saving time or a local time rule applied. When the recorded time is uncertain, it is better to compare the chart with real life events instead of deciding only by a formula.
True solar time is therefore a practical correction method. It does not make Saju more complicated for its own sake; it helps the chart begin from a more accurate birth moment.
Cases where true solar time should be checked
In the original article, true solar time is not presented as something that must be applied to everyone. It becomes important in several specific cases: when the birth time is close to the boundary between two hour pillars, when the birth place is far from the standard meridian, when the chart does not seem to match the person's actual temperament or life flow, and when the reader wants a more precise Saju analysis.
Standard time and true solar time
Standard time exists so that society can share one convenient clock. True solar time, however, follows the real position of the sun. Korea uses one standard time nationwide, but Seoul, Busan, Jeju, and Gangneung do not all experience solar noon at exactly the same clock time. That is why birth place matters when the correction is calculated.
When correction changes the chart
If the birth time is near the middle of an hour branch, the correction often does not change the chart. If it is close to a boundary, even a small correction can change the hour pillar. Because the hour pillar can affect personality, children, later-life tendencies, inner psychology, and several timing judgments, checking true solar time can improve the accuracy of the reading.
Information needed for calculation
For a careful calculation, prepare the solar or lunar birth date, the exact recorded birth time, the birth place, whether daylight saving time applied, and the time standard used at the time of birth. For old birth records, family memory may be approximate, so it is better to compare the corrected chart with real temperament, major events, and life changes.
The conclusion of the original post is simple: true solar time is a correction method used to see the birth moment more precisely. It should be checked especially when the birth time is near an hour-pillar boundary.
Use this reading in practice
If you want to check the same topic on your own chart, first confirm your day master, the distribution of the five elements, and the current ten-year and yearly luck cycles. Then compare the result with the specific question you are asking instead of deciding from one character alone.