True solar time is not the default public calculation basis in this product, but it is stored and audited for boundary-sensitive births. That lets the service surface a warning when hour-pillar or day-rollover interpretation risk is materially higher than usual.
Glossary
True Solar Time
A location-aware time audit that adjusts local clock time using longitude and solar drift.
saju tell u
See how the term works inside a real chart.
Glossary language becomes meaningful when it is tied back to your own Four Pillars structure.