It begins every year with the Aries pseudo-constellation, which is based on the position of the Sun at the spring equinox on March 21.As the website explains it: Western astrology is based on the planets and their motion relative to our year (the Earth’s annual orbit of the Sun) and not on the distant stars. It depicts duality both in a beautiful and a strange way.
The 12 sign zodiac was defined by the stars within chosen constellations along the ecliptic (the apparent annual path of the Sun) in Mesopotamia at the end of the Iron Age (around 500 BC).
The Gemini star sign is an extroverted air sign (element) and an adaptable mutable sign (quality).
As the only mutable air sign in the zodiac, Gemini people are quick-witted, versatile and known for changing their mind.
Rather than following the movement of the visible stars, Western astrology is based on the apparent path of the Sun as seen from our vantage point on earth.
Within that path, astrologers have carved out static zones, and we track the planetary movements against these.