THE TWINS OF CHAOS. Gemini is like, this super confusing thing ... but also kinda awesome. In astrology land, Gemini is the third sign of the zodiac - meaning if you were born between May 21 and June 20, you're basically two people in one. Like having a split personality without the disorder. One minute you're all chatty, the next you're deep in thought. No problem. Geminis are ruled by Mercury (the planet of communication), so expect them to be texting, gossiping, and doing a million things at once. And psst ... there's also a constellation in the northern hemisphere with the twins in it. But honestly, who needs astronomy when you've got twin personalities to juggle.