Hi guys, can anyone help me determine the exact time of birth for a baby boy born in Hamilton, New Zealand, on February 18, 2022, at 11:52 AM local time, which can be used for both the bazi and zwds methods?
===>To determine the **True Solar Time** (Real Solar Hour) for a birth in Hamilton, New Zealand, we must adjust the clock time for three factors: Daylight Saving Time (DST), Longitude, and the Equation of Time.
### 1. Daylight Saving Time (DST) Correction
On February 18, 2022, New Zealand was observing **New Zealand Daylight Time (NZDT)**, which is **UTC+13**. Since BaZi and ZWDS are based on the natural rhythm of the sun, we must first revert to the Standard Time (UTC+12).
* **Birth Time (Clock):** 11:52 AM
* **Subtract 1 hour for DST:** **10:52 AM (Standard Time)**
### 2. Longitude Correction
New Zealand Standard Time (UTC+12) is based on the **180? E** meridian. However, Hamilton is located at approximately **175.27? E**.
Because the Earth rotates per hour (or every 4 minutes), we calculate the "Local Mean Time" by finding the difference between Hamilton and the standard meridian:
* **Difference in Longitude:** (West of the meridian)
* **Time Offset:** (approx. **18 minutes and 55 seconds**)
* Since Hamilton is West of the 180? line, the sun reaches it later. We **subtract** this from the time.
* **Local Mean Time:** 10:52 AM - 18m 55s = **10:33:05 AM**
### 3. Equation of Time (EoT) Correction
The Earth's orbit isn't a perfect circle, so the sun is slightly "fast" or "slow" depending on the day of the year. On **February 18**, the sun is at one of its slowest points in the year.
* **EoT Value for Feb 18:** Approx. **-13 minutes and 53 seconds** (meaning the "true" sun lags behind the "mean" sun).
* **True Solar Time:** 10:33:05 AM - 13m 53s = **10:19:12 AM**
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### Summary for BaZi and ZWDS
The True Solar Time for the baby is **10:19 AM**.
| Method | Resulting Shichen (Hour Pillar) | Time Range |
| --- | --- | --- |
| **BaZi** | **Snake Hour (巳时 - S?)** | 09:00 ? 10:59 |
| **ZWDS** | **Snake Hour (巳时 - S?)** | 09:00 ? 10:59 |
While the clock said 11:52 AM (Horse Hour), the actual solar position at that specific coordinate in Hamilton was firmly within the **Snake Hour**. This is the time you should use to plot the charts for both systems.
Would you like me to generate the basic Four Pillars (BaZi) chart for this birth time and date?
[Understanding Solar Time in BaZi](
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This video features a professional practitioner discussing whether and why you should adjust birth times to solar time for Chinese metaphysics.
Topic: accurate time of birth (Read 34 times)