International Astrology Day is observed worldwide every year on March 20, coinciding with the vernal equinox in the Northern Hemisphere. This date marks the beginning of a new astrological year and the first day of the astrological sign of Aries, which is significant in both astrology and astronomy. Celebrations can occur between March 19 and 22, but March 20 is the most common date. The holiday was initiated by the Association for Astrological Networking in 1993, replacing their previous Astrology Awareness Weekends. The spring equinox is particularly important as it symbolizes the equal length of day and night and the transition of the Sun from the Southern Hemisphere to the Northern Hemisphere.