中华万年历

时辰是中国传统的计时单位，将一天分为十二个时段，每个时段两个小时，各对应一个地支和一种生肖。这一系统不仅用于计时，还与中医经络理论、命理学和日常养生深度关联。

在现代钟表将一天切割成二十四个均等小时之前，中国已经拥有了一套运行了数千年的精密计时系统。十二时辰不仅仅是时间的刻度——它们是十二种截然不同的宇宙能量状态，每一种都与一个地支、一种生肖动物和一条人体经络相对应。

古代中医认为，气血在人体的十二条主要经络中循环流动，每两个小时集中在一条经络上。这意味着你的身体每天经历十二个不同的能量高峰和低谷，与十二时辰精确同步。理解时辰，就是理解身体的内在节律。

The traditional Chinese time system divides each day into twelve two-hour periods called "shichen," each named after one of the Twelve Earthly Branches and associated with a zodiac animal. This system is deeply integrated with Traditional Chinese Medicine, which maps each period to a specific organ and its peak activity time.

Ancient Chinese physicians made a discovery that modern chronobiology is only now beginning to confirm: the human body runs on a clock. Not the mechanical clock of hours and minutes, but a deep biological rhythm that cycles through twelve phases every twenty-four hours, with each phase activating a different organ system.

They called these phases "shichen" — double hours — and mapped them to the Twelve Earthly Branches, the twelve zodiac animals, and the twelve primary meridians of the body. The result was a unified theory of time that connected the cosmic movements of stars and seasons to the intimate rhythms of breath, digestion, and sleep within every human body.