![]() (For a more complex and detailed description, we encourage you to read Denenberg’s explanation for yourself or research the equation of time.) Humans have a hand in this as well The earliest sunset occurs more than a month before the latest winter sunrise in parts of the southern U.S.ĭECEMBER WINTER WEATHER OUTLOOK: COLD AIR TO WIN OUT OVER NORTHERN U.S. Still, it might take until early to mid-January to start slowly gaining morning daylight. ![]() So while mornings might be getting noticeably shorter by the Fourth of July, the evening light continues to hang on later than it does all year.ĭate of earliest sunrise and latest sunset in summer.Ĭonversely, you’re probably already enjoying longer evenings on Christmas Day and New Year’s Eve than earlier in December. Larry Denenberg.īut these minor variances in Earth's orbit result in the displacement of the earliest sunrises and latest sunsets in the weeks surrounding June’s summer solstice. If you want to dive into the astronomical details, check out this well-written explanation by Harvard-graduate Dr. This, combined with the Earth slightly changing the speed at which it revolves around the sun at different points throughout the year, is the simplest explanation for why the solstices generally don’t have the earliest and latest sunrises and sunsets.įrom there, the explanation gets quite complex. ![]() ![]() The Earth is closer to the sun in January (perihelion) than in July (aphelion) due to its elliptically shaped orbit. ![]() The primary reason the earliest and latest sunrises and sunsets don’t coincide with the solstices is best explained by the equation of time.įor starters, the Earth is not perfectly round, and neither is its orbit around the sun. Date of earliest sunset and latest sunrise in winter. ![]()
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