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Transcript
00:00Winter solstice, 2020, 4, know everything about shortest day of the year.
00:10When is winter solstice staring?
00:12The winter solstice on 2020, 4 occurs on December 20, 1 at 14, 50, 1 ISD.
00:21It signals the start of winter in the northern hemisphere and summer in the southern hemisphere.
00:29Astronomical changes at the solstice.
00:31The solstice represents the sun's southernmost point in the sky.
00:35In the northern hemisphere, it begins winter with long nights and short days.
00:42Astronomical basis of the solstice.
00:44The solstice is an astronomical phenomenon caused by Earth's axial tilt of 20, 3.5 degrees.
00:51This tilt, along with Earth's orbit, makes hemispheres alternately receive direct sunlight.
00:58Shortest day, not earliest sunset.
01:00Though solstice marks the year's shortest day in the north, the earliest sunset happens
01:04earlier.
01:05This occurs due to variations between solar noon and clock time around December 21.
01:13Polar extremes during solstice.
01:15At the December solstice, the North Pole remains in darkness, while the South Pole experiences
01:20continuous daylight.
01:22Northern areas see days shorter than 12 IOS.
01:27Signs of solstice in nature.
01:28In the northern hemisphere, observe late dawns, early sunsets, and long noontime shadows.
01:33Conversely, in the south, expect early dawns, late sunsets, and shorter shadows at noon.
01:41Cycle of solar events.
01:43The solstice forms part of a recurring sequence.
01:47Earliest sunset, shortest day, and latest sunrise for the north.
01:50Or earliest sunrise, longest day, and latest sunset for the south.