Monday 21 December 2015

The 2015 December Solstice.

The December (or Southern) Solstice this year falls on Tuesday 22 December, when the Sun is at its southernmost point in the sky. This is the shortest day of the year in the Northern Hemisphere, where it is known as the Winter Solstice and the longest day in the Southern Hemisphere, where it is known as the Summer Solstice. At very high latitudes the sun may not rise (Northern Hemisphere) or set (Southern Hemisphere) for several weeks on either side of the Southern Solstice.

The solstices are entirely a product of variation in the Earth's rotation on its axis, which is at an angle of 23.5° to the plain of the Earth's orbit about the Sun. This means that in December the Earth's Southern Pole is tilted towards the Sun, while the Northern Pole is tilted away from it. This means that around the Southern Solstice the Southern Hemisphere is receiving radiation from the Sun over a longer part of the than the Northern, and at a steeper angle (so that it to pass through less atmosphere to reach the planet), creating the southern summer and northern winter.

The tilt of the Earth during the December Solstice. Wikimedia Commons.

The solstices are fairly noticeable astronomical events, and tied to the seasons which govern the life cycles of life on Earth, and they have been celebrated under different names by cultures across the globe, but most notably by those at higher latitudes, who are more profoundly affected by the changes of the seasons.

See also... of the Supermoon.                              A total Lunar Eclipse will occur on 28 September 2015, starting at about ten minutes past midnight GMT. It will be visible across much of Western Europe and... Equinox 2015.                              The September Equinox will fall on Friday 23 September 2015, when the day and night will be of equal length in both of the Earth's hemispheres. The Earth's seasons are driven by the tilt of the planet, but the planet does not, as is generally assumed, tilt back and forth over the course of a year. Rather it remains at a constant... Solar Eclipse to be visible from Southern Africa, Madagascar and Antarctica on 13 September 2015.                                   A partial Solar Eclipse will occur on Sunday 13 September 2015, visible from all of Namibia, Botswana, South Africa, Lesotho, Swaziland, Zimbabwe and Reunion Island and parts of Angola, Zambia, Mozambique, Madagascar and Antarctica. The eclipse will occur between 4.41 am and 9.06 am GMT.
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