International Astrology Day is celebrated/observed depending on the exact day that the Northward equinox actually occurs. This varies year to year between March 19–22, though it usually falls on March 20 or March 21.
The date of the holiday occurs at the same time of the Iranian new year (Norouz), which is celebrated in many places throughout the Middle East and Central Asia. It also corresponds with the beginning of the Bahá'í calendar, which is celebrated as Bahá'í Naw-Rúz. Other holidays occurring around this time include Ostara (amongst neopagans), Chunfen in China, and Vernal Equinox Day (a public holiday in Japan), among others.
International Astrology Day was founded by the Association For Astrological Networking (AFAN) in 1993, an outgrowth of the "Astrology Awareness Weekends" which AFAN had sponsored for several years previously. The goals of the new holiday were to expand networking opportunities among the astrological community, to direct media attention to positive aspects of astrology, and to help raise funds for local astrological groups and for AFAN's legal, media, and other networking projects