Not physicists. Not philosophers. Not the men who wrote these books. We are not going to pretend otherwise — and that turns out to be the interesting part.
What we can do is cast your chart correctly, on true solar time, and name the book behind every line of it. What you do after reading it was never in the chart.
This is a free bazi calculator — 八字, the Chinese four-pillar birth chart. It answers what is my day master, prints your four pillars with their hidden stems and Ten Gods, and gives the daily Chinese almanac (黃曆) read against your own chart. The same four pillars are what Korean saju is built on, so a saju reading starts from this identical calculation.
Two things most English-language calculators skip. Your chart is cast on true solar time rather than clock time, which can move your hour pillar and, near local midnight, your day pillar. And the year turns at 立春 Start of Spring, not on 1 January — which is why roughly one person in ten has been told the wrong zodiac animal their whole life.