Zodiac and Solar Terms: Change at Start-of-Spring or Lunar New Year?
There is long-standing debate over when zodiac signs switch.
1. Change at Start-of-Spring (traditional numerology view)
In ancient eight-characters fate-calculation, Start-of-Spring marks the new year. It is the first solar term, representing yin-yang transition. Those born before Start-of-Spring belong to last-year's zodiac; those born after belong to the new year. Many fortune-tellers follow this rule.
2. Change at Lunar New Year (folk custom)
In ordinary daily life, zodiac switches on Lunar New Year's Day (first day of lunar January). After New-Year's Eve, the new zodiac takes effect. Most calendars and public culture follow this rule.
Summary:
For fate-chart calculation: follow Start-of-Spring
For daily life and festival customs: follow Lunar New Year's Day
Both viewpoints have their own foundations. The conflict comes from two different traditional cultural systems.