One day, I noticed something odd.
The starting dates of Western zodiac signs and the dates of the Chinese solar terms — specifically the ‘jieqi’— almost perfectly coincide.
| Zodiac Sign | Start Date | Solar Term | Difference |
| Aquarius | Jan 20 | Major Cold (大寒) | ≈ 0 days |
| Pisces | Feb 19 | Rain Water (雨水) | 1 day |
| Aries | Mar 21 | Spring Equinox (春分) | ≈ 0 days |
| Taurus | Apr 20 | Grain Rain (谷雨) | ≈ 0 days |
| Gemini | May 21 | Grain Buds (小满) | ≈ 0 days |
| Cancer | Jun 22 | Summer Solstice (夏至) | ≈ 0 days |
| Leo | Jul 23 | Major Heat (大暑) | 1 day |
| Virgo | Aug 23 | End of Heat (处暑) | 1 day |
| Libra | Sep 23 | Autumnal Equinox (秋分) | ≈ 0 days |
| Scorpio | Oct 24 | Frost’s Descent (霜降) | ≈ 0 days |
| Sagittarius | Nov 23 | Minor Snow (小雪) | 1 day |
| Capricorn | Dec 22 | Winter Solstice (冬至) | ≈ 0 days |
Twelve zodiac signs. Twelve solar terms. A maximum offset of one day. This cannot be coincidence.
Two systems, born on opposite ends of the Earth, separated by thousands of years, with no known contact between them — yet pointing to the same set of dates.
What does this tell us? They were observing the same thing. Not the stars, not mythology — but the relative position of the Sun and the Earth: the key turning points in light and climate change throughout the year.
I have never believed that stars determine personality. But I believe something else: the guidance solar terms offer to agriculture is real and effective. Farmers in ancient China sowed, cultivated, and harvested according to these nodes — not superstition, but thousands of years of accumulated observation.
And that raised a question:
If specific patterns of light and temperature can influence the growth rhythm of plants, could they also leave some kind of trace on a human being in the most rapid and critical phase of development?
With that question, I began to research seriously.
The conclusion surprised me: the climate environment at the time of birth does correlate with temperamental tendencies in human beings.
Your birth chart isn’t written in the stars. It’s written in the temperature and light of the world you were born into.