![]() It is at its shortest, around 23 hours 59 minutes 38 seconds, in mid September and at its longest, around 24 hours 30 seconds around Christmas Day. The length of a solar day varies throughout the year. The table shows that during December the solar noon drifts later by about 30 seconds each day.Ī solar day is the period of time between solar noon on one day and solar noon on the next day. The final column shows the solar noon, the time of day that the Sun is at its highest in the sky or, to put it another way, the mid-point between sunrise and sunset. This clearly shows that 21 December has the shortest period of daylight, but while the time of sunrise continues to get later and later throughout the whole of December, the time of sunset stops getting earlier around 12 December. ![]() In the table above, the daylight column shows the number of hours, minutes and seconds between sunrise and sunset. The table below shows the sunrise and sunset times for London for December at three day intervals. This post aims to explain this interesting phenomenon. The evenings in fact start to draw out a week or so before December 21, so it is already getting lighter in the evenings, although it does not start to get lighter in the mornings until early in the new year. Many people think that it will continue to get dark earlier each day in the afternoon until we reach 21 December, the winter solstice. As I complete this post from my home in Manchester, England, it is 4:30 pm and already dark outside. ![]()
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