Wednesday, January 4, 2012

Sunset Prevalence

The time of sunset varies all year long, and is decided by the viewer's place on Earth, specified by longitude and latitude, and elevation. Small day by day changes and noticeable semi-annual adjustments within the timing of sunsets are pushed by the axial tilt of Earth, each day rotation of the Earth, the planet's movement in its annual elliptical orbit across the Sun, and the Earth and Moon's paired revolutions around every other. In the summertime, the days get longer and sunsets happen later every day till the day of the most recent sundown, which happens after the summer solstice. Within the Northern Hemisphere, the most recent sundown occurs late in June or in early July, however not on the summer season solstice of June 21. This date depends on the viewer's latitude (related with the Earth's slower motion across the aphelion around July 4). Likewise, the earliest sunset does not happen on the winter solstice, but fairly about two weeks earlier, again relying on the viewer's latitude. In the Northern Hemisphere, it occurs in early December (influence from the Earth's sooner motion near the perihelion, which occurs round January 3


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