here shortest day 9 hours 8 minutes earliest sunset 4:35 from 12/9/15 to 12/13/15 latest sunrise 7:33 am from 12/29/15 to 12/2/16
This is what I remember from a astronomy course I took, copied from earth/sky website http://earthsky.org/earth/winter-solstice-and-late-sunrise
In short, the earliest sunset/winter solstice/latest sunrise and earliest sunrise/summer solstice/latest sunset phenomena are due to the fact that true solar days are longer than 24 hours long for several weeks before and after the solstices. At and around the solstices, the Earth must rotate farther on its axis for the sun to return to its daily noontime position, primarily because the sun is appreciably north or south of the Earth’s equator.
However, perihelion accentuates the effect around the December solstice, giving a day length of 24 hours 30 seconds. And aphelion lessens the effect around the June solstice, giving a day length of 24 hours 13 seconds.
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