Time zone

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The Shi Chen (时辰) system is based on local solar time, not the standard time zone time we use on clocks today . This is a crucial distinction for anyone using the calendar for astrology or traditional practices. Here is the breakdown of why this matters and how to find the correct time. ? Why Clock Time Isn't Enough When we match Shi Chen to modern clocks, we usually use a fixed table, like "辰时 (Chen Shi) is 7-9 AM" . However, this table is only accurate for locations near the 120° east longitude line, which is the reference for China's national standard time (Beijing Time) . Because Shi Chen is based on the sun's actual position, the clock time for the same hour (e.g., noon) will be different for a city in eastern China versus a city in the west . ? How to Determine the Correct Shi Chen To find the accurate Shi Chen for a specific location, you can follow these steps: Use Local Solar Time: The most accurate method is to use the "true solar time" of your specific longitude. This means adjusting your standard clock time to account for the difference between your location and the reference longitude (e.g., 120°E) . Consider an App: For practical use, there are specialized calendar apps (sometimes called "Stem-Branch Clocks" or 干支時鐘) that can automatically calculate this for you. You can set your specific location, and they will adjust for the time zone and even for "true solar time" to give you the precise Shi Chen . In short, while the concept of a 12-part day is universal, the specific clock time for each Shi Chen is unique to your location on Earth.