What it means
Gemini is an air sign and a mutable sign, which makes it adaptable and comfortable with change. Its symbol is the twins, often read as two sides of one mind holding a conversation. Mercury, its ruler, governs speech, writing, trade and short trips. The Codex calls the Gemini Sun the messenger: its purpose is to learn, connect and circulate information. This Sun tends to shine when it is mentally stimulated, swapping ideas, and introducing people who ought to know each other. In daily life that can look like several books open at once and a habit of asking one more question than anyone expected.
Strengths
Curiosity, wit, quick learning, flexibility, and a gift for explaining things clearly.
Challenges
Restlessness, scattered attention, boredom with routine, and sometimes talking around a feeling instead of naming it.
Dates
The Sun moves through Gemini from about May 21 to June 20. The exact dates shift by a day or so from year to year, so if you were born near either edge, your birth time and place decide which sign your Sun is in. A free blueprint calculates it exactly.
How Cosmic Array reads it
Your Sun is one part of the chart, not the whole of it. The Moon and Rising sign change the picture: a Gemini Sun with a Scorpio Moon may keep conversation light and fast while privately feeling things very deeply, and only a few people get to see that side. Cosmic Array also reads your Sun against your numerology and Human Design, and where they pull in different directions, the blueprint names that tension instead of picking one side.