The answer to which Sun sign you are is not complicated. Your Sun sign is always determined by your date of birth. As a general rule, the signs are divided up as this: Aries: Spring equinox (21 March) to 19 April Taurus: 20 April to 20 May Gemini: 21…But if you are born on the edge of these date ranges you will have to look to the exact time you were born to chart the position of the sun at that time.