1. (noun) March 21

• march equinox
• spring equinox

1. (noun) (astronomy) the equinoctial point that lies in the constellation of Pisces

• astronomy
• uranology

1. (noun) March 21

• equinox

2. (noun) (astronomy) the equinoctial point that lies in the constellation of Pisces

• equinoctial point
• equinox

1. (noun) March 21

• noruz
• nowrooz
• nowruz

1. (noun) March 21

• autumnal equinox
• fall equinox
• september equinox