Astronomy Day!
Astronomy Day is a holiday which is celebrated not once during a calendar year but twice a year – once in spring and once in fall. The springtime celebration falls on the Saturday closest to the first quarter moon (which is around April or May). The fall time celebration of this holiday falls on the Saturday closest to the quarter moon (which is around September or October). The purpose of this holiday is not only to celebrate astronomy and all of its contributions to society but also to bring the general public together with astronomy professionals and groups.
More about Astronomy!