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In 2021 the September equinox occurs on September 22 when the Sun crosses the celestial equator going south. This event occurs at the same moment worldwide, but clock time will differ depending on your time zone. It will happen at 19:21 UTC [Greenwich Mean Time]. Here are a few northern hemisphere times from the USA's west coast to western Europe: 12:21 PDT, 15:21 EDT, 20:21 BST, 21:21 CEST.
