Before this era were figurines of the pregnant goddess. Goddess worship was predominant because it was recognized that women gave birth, therefore the Divine must be feminine. It was during the Age of Gemini that humans learned that it took both man and woman to create life. Always in a given Age, the opposite constellation, being its polarization, has much influence on it as well. The polar opposite of Gemini is Sagittarius, the centaur.
Humans are animals, more specifically mammals, and even more specifically primates.
Like the Sagittarius centaur, who holds a bow in its hand about to release an arrow, humans strive still to be more and reach for the heavens to understand the spiritual and connect with the Divine. Historically, we know that humans changed from being nomadic hunters and gatherers to being an agrarian civilization. Taurus, the bull, represents material possession. When the men went out hunting, they left the women behind to gather. While gathering, women learned the art of growing food and domesticating animals.