Aries is the first astrological sign in the zodiac which is associated with the constellation Aries. Under the tropical zodiac, the Sun transits this sign mostly between March 21 and April 20 each year. Aries is a sign of initiative; a leader, with bravery, and the autonomy required to commence. Uncomfortable with inaction, Aries is the Cardinal sign of Fire, and thus is the zodiac of drive. Ruled by Mars, Aries is strongly autonomous, and can be headstrong and crass, sometimes showing an impulsive or reckless approach to issues.