Winter Solstice. Google marks the first day of winter solstice winter astronomical or through an animation displayed on the home page of the search engine. The letters that make up the Google logo are redesigned, becoming like children building a snowman. First day of astronomical winter or the winter solstice in the northern hemisphere of the Earth is held annually on or around 21 December. According to the site Astronomical Observatory Amiral Vasile Urseanu winter solstice 2014 will be held on 22 December at 01.03 GMT. The winter solstice is the shortest day of the year. At this time, the day is the minimum value of year, 8 hours and 50 minutes, and during the night is the maximum, 15 hours and 10 minutes (values calculated for Bucharest), according to astro-Urseanu. en. At the same time, in the southern hemisphere of Earth opposite phenomenon occurs, that occurs summer solstice, when marking the astronomical beginning of summer for the southern hemisphere of the Earth. Solstices occur due to the tilt axis to the plane of the planet Earth orbit by about 66 degrees. For this reason, the movement was apparent, the Sun within one year through the circle of the celestial sphere called the ecliptic whose inclination to the celestial equator is 23 degrees. At the winter solstice, the Sun is in the southern hemisphere of the celestial sphere, the maximum angular distance of 23 degrees south of the equator, the star performing diurnal motion along the circle parallel to the celestial equator, called Tropic of Capricorn. This explains, for middle latitudes of the Earth, inequality days and nights and the seasons.
Posted on: Sun, 21 Dec 2014 07:57:18 +0000
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