Tropical vs Sidereal Zodiac
The tropical zodiac is fixed to the equinoxes; the sidereal zodiac is fixed to the stellar background. Both are valid; they answer different questions.
Tropical and sidereal zodiacs differ in how they define 0° Aries. The tropical zodiac (used in most Western astrology) fixes 0° Aries to the vernal equinox—the moment the Sun crosses the celestial equator in spring. The sidereal zodiac (used in Vedic/Jyotish) fixes 0° Aries to a reference star or point in the stellar background; because of precession, the two systems drift apart (currently about 24°).
Neither is "wrong." Tropical emphasizes seasons and the Sun–Earth relationship; sidereal aligns with the fixed stars and is standard in Vedic techniques (dashas, nakshatras). AI astrology and calculators (e.g. using NASA DE441) can compute both; the choice depends on the tradition and the question asked.