Why they add new zodiac sign?

Answer 1

The claim is that the planet positions and stars have shifted. I suspect someone in the Zodiac calendar business is creating a need for people to buy all new zodiac stuff.

Answer 2

The addition of a new zodiac sign, such as Ophiuchus, is based on the precession of the Earth's axis over time. This phenomenon causes the constellations to shift in relation to the Earth's position, leading some astrologers to include Ophiuchus as a thirteenth sign. However, this change is not widely accepted or recognized in mainstream Astrology.