Celebrating Autumn Equinox through Creative Ritual The equinox occurs twice annually, once in March (spring equinox) and again in September (autumn equinox). The autumn equinox takes place on September 22nd this year 2021. What is an equinox? The word equinox originates form a Latin word meaning equal-night. At this time, day and night are of equal … More Seasonal Celebrations: Mabon (Autumn Equinox)