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Noun september equinox has 1 sense
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Definitions from the WebSeptember EquinoxDefinition:The September Equinox, also known as the Autumnal Equinox, is an astronomical event that occurs in September, marking the start of autumn in the northern hemisphere and spring in the southern hemisphere. During this equinox, the sun is directly above the Earth's equator, resulting in almost equal lengths of day and night across the globe. Sample Sentences:
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