Origin of Yin Yang Symbol
The Chinese characters of I-Ching are
By observing the sky, recording the Dipper's positions and watching the shadow of the Sun from an 8-foot (Chinese measurement) pole, ancient Chinese determined the four directions. The direction of sunrise is the East; the direction of sunset is the West; the direction of the shortest shadow is the South and the direction of the longest shadow is the North. At night, the direction of the Polaris star is the North.
They noticed the seasonal changes. When the Dipper points to the East, it's spring; when the Dipper points to the South, it's summer; when the Dipper points to the West, it's fall; when the Dipper points to the North, it's winter.
When observing the cycle of the Sun, ancient Chinese simply used a pole about 8 feet long, posted at right angles to the ground and recorded positions of the shadow. Then they found the length of a year is around 365.25 days. They even divided the year's cycle into 24 Segments, including the Vernal Equinox, Autumnal Equinox, Summer Solstice and Winter Solstice, using the sunrise and Dipper positions.
They used six concentric circles, marked the 24-Segment points, divided the circles into 24 sectors and recorded the length of shadow every day. The shortest shadow is found on the day of Summer Solstice. The longest shadow is found on the day of Winter Solstice. After connecting each lines and dimming Yin Part from Summer Solstice to Winter Solstice, the Sun chart looks like below. The ecliptic angle 23 26' 19'' of the Earth can be seen in this chart.
The Ecliptic is the Sun's apparent path around the Earth. It's tilted relative to the Earth's equator. The value of obliquity of the Ecliptic is around 23 26' 19'' in year 2000.
By rotating the Sun chart and positioning the Winter Solstice at the bottom, it will look like
In general, the Yin Yang symbol is a Chinese representation of the entire celestial phenomenon. It contains the cycle of Sun, four seasons, 24-Segment Chi, the foundation of the I-Ching and the Chinese calendar.
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Why does Yin Yang Symbol look like that way? I posted "Where does the Yin Yang Symbol come from?" article to answer the question in the early 2001 or before. This article was copied, reprinted, rewritten or translated by many people. Today's Internet is quite different from 17 years ago. I modify the article format and layout to meet the requirements of mobile devices. I am very appreciated for anyone to add a following social media link for this page.
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This article and diagram of 'Where does the Yin Yang Symbol come from?" have been reprinted by professors around the world to their students. The article is reprinted in the book of "Pi: A Biography of the World's Most Mysterious Number" by Dr. Alfred S. Posamentier and Dr. Ingmar Lehman.
Dr. Gregory K. Lee also reprinted this page in his book of "Student Survival Guide for Physical Geography".
The book of "The science of Planetary Signatures in Medicine - Restoring the Comic Foundations of Healing" by Jennifer T. Gehl and Dr. Marc S. Micozzi also refers this page.
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