When Does Winter Begin 2025 Usa. The first day of winter (winter solstice or december solstice) is when the sun is in its most southern position directly over the tropic of capricorn. If the astronomical or calendrical seasons begin with the equinoxes (spring and autumn) and solstices (summer and winter), in meteorology, they begin earlier.
Est, which also marks the winter. What is daylight saving time?
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