Aries is known as the first sign of the zodiac primarily because of its alignment with the Vernal Equinox. This marks the beginning of Spring in the Northern Hemisphere. This Equinox typically occurs around 21st March when the Sun moves into the first point of Aries. Many cultures have considered this time as the beginning of the New Year. In astrology, Aries, as the first sign of the zodiac, signifies a burst of renewed energy and opportunities and the initiation of new projects. This mirrors nature's growth and renewal during the spring season.