Holiday:
The winter solstice occurs in
winter. It is the time at which the sun appears at noon at
its lowest altitude above the horizon.
In the Northern Hemisphere this is the Southern solstice,
the time at which the Sun is at its southernmost point in
the sky, which usually occurs on December 21 to 22 each
year. In the Southern Hemisphere this is the Northern
solstice, the time at which the Sun is at its northernmost
point in the sky, which usually occurs on June 20 to 21 each
year.
The axial tilt of Earth and gyroscopic effects of the
planet's daily rotation keep the axis of rotation pointed at
the same point in the sky. As the Earth follows its orbit
around the Sun, the same hemisphere that faced away from the
Sun, experiencing winter, will, in half a year, face towards
the Sun and experience summer. Since the two hemispheres
face opposite directions along the planetary pole, as one
polar hemisphere experiences winter, the other experiences
summer.
More evident from high latitudes, a hemisphere's winter
solstice occurs on the shortest day and longest night of the
year, when the sun's daily maximum elevation in the sky is
the lowest. Since the winter solstice lasts only a moment in
time, other terms are often used for the day on which it
occurs, such as "midwinter", "the longest night" or "the
shortest day". But it should not be confused with "the first
day of winter" or "the start of winter" (Lidong in the East
Asian calendars). The seasonal significance of the winter
solstice is in the reversal of the gradual lengthening of
nights and shortening of days. The earliest sunset and
latest sunrise dates differ from winter solstice, however,
and these depend on latitude, due to the variation in the
solar day throughout the year caused by the Earth's
elliptical orbit (see earliest and latest sunrise and
sunset).
Worldwide, interpretation of the event has varied from
culture to culture, but many cultures have held a
recognition of rebirth, involving holidays, festivals,
gatherings, rituals or other celebrations around that time.
Source:
Wikipedia: Winter solstice |
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