When Is Spring Equinox 2026 Usa. This is also the first day of spring (vernal equinox) in the northern hemisphere and the first day of fall (autumnal equinox) in the southern hemisphere. The first day of spring (march equinox or vernal equinox) is when the sun shines directly on the celestial equator passing from south to north and the length of day and night.
Each season brings different weather, hours of light, and. First day of spring in usa and uk, when is spring vernal equinox in usa 2025?
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