The timing of sunset varies with the time of year and the latitude of the location from which it is viewed (and, in local time, with the location's precise longitude). Changes in timing of sunset are driven by the axial tilt of Earth and the planet's movement around its orbit, however in the Northern Hemisphere (for example), the earliest sunset is not at the winter solstice around December 21, but rather in early December. Likewise, the latest sunset is not around June 21 (the summer solstice), but in early July. (The dates may be swapped for sunset timings in the Southern Hemisphere.) For one or two weeks surrounding both solstices, both sunrise and sunset get slightly later each day. Even on the equator, sunrise and sunset shift several minutes back and forth through the year, along with solar noon. This effect is plotted by an analemma.













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As sunrise and sunset are calculated from the leading and trailing edges of the Sun, and not the center; this slightly increases the duration of "day" relative to "night". Further, because the light from the Sun is bent by the variable density of the Earth's atmosphere, the Sun is still seen after it is below the horizon. This effect is a daily illusion along with sunrise. As a visual motif, sunset is often associated with summer, and (particularly when paired with a coconut palm) beach living and surfing culture. This may be due in the first instance to people spending more time outdoors in the evening during summer than during winter, and also because pictures of sunsets over the sea are often more spectacular than daytime beach scenes (see images below).


Above Images Are From The NOAA





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