Aries is the first sign of the zodiac. Aries is a fire sign and uses a ram as its symbol. The timeline of Aries is March 21 to April 20. As with all zodiac signs, people born under Aries have both good and bad traits: they get along with some signs better than others and they have a better chance at succeeding at certain careers. Aries people are connected to the color red; their birthstone is the diamond; their lucky day is Tuesday; their lucky number is nine; and their ruling planet is Mars.