Gemini is ruled by Mercury. It is Air element, Mutable and Proactive.
Gemini sets out to see what's going on outside and get new ideas to allow the community to develop. His inner curiosity keeps them moving all the time. People of Gemini tend to use their rational and intellectual intelligence to understand and discover their personal world. It is inevitable for them to answer a single blinking question in their head: Why? In every aspect of their lives, in every direction, from personal to non-personal, the situation is the same in all areas. This need to know may cause them to sail into the realm of foreign countries; especially if the Sun is in the ninth house where the need to discover other cultures and traditions is at their highest.