Thursday, September 20, 2012
September and will last 89 days and 20 hours
There will be a penumbral lunar eclipse on November 28, which will be visible in Spain
Fall hit the 16.49 hours (GMT) on Saturday, September 22, and will last 89 days and 20 hours. The season will end on December 21 with the arrival of winter, according to the National Geographic Institute.
So, begin to fall again in the northern hemisphere, to the time when spring begins in the southern hemisphere. The astronomical start of stations is given, by convention, as the moment when the Earth passes through a given position in its orbit around the Sun.
This position, in case of fall, is from the center of the Sun as seen from Earth crosses the celestial Ecuador in its apparent movement southward. The day this happens, the length of day and night practically coincide, and therefore, this circumstance is also called autumn equinox. At this time in the southern hemisphere spring starts.
The autumnal equinox can occur in four different dates, ranging from 21 to 24 September. Throughout the twenty-first century will begin in the fall on 22 and 23 September (Spanish official date), being its most tempranero the beginning of 2096 and the later onset of 2003.
The reason why the date varies from year to year are due to the sequence mode according to the calendar year, and that some years are leap and others do not, with the duration of each orbit of the Earth around the Sun (known as tropical year duration).
Among the unique characteristics of autumn is the time change, which this time will be effective on October 28, thus recovering the winter time.
Also, this season is the time of year when day length shortens faster, since in the latitude of the Peninsula, the sun rises in the morning, more than one minute later than the previous day and evening shortens two minutes each day before, so it is particularly appreciable evening. In short, these days the time when the Sun is above the horizon is reduced by almost three minutes each day.
Specifically, this fall will live two eclipses. On November 13, a partial solar eclipse will be visible in Australia, New Zealand, South Pacific, Antarctica and southern South America . This eclipse will be accompanied by one of Moon penumbral to give two weeks later, on November 28, and will be seen in Spain. First contact with penumbra will be 1315 hours (GMT), the partial eclipse will be visible from 13.46 hours and reach the maximum at 15.34 hours. The eclipse will end at 17.51 hours.
Moreover, Jupiter will be visible from most of the night after dark and also on December 1 will produce annual closest approach to Earth, reaching an angular diameter of 48 ". Saturn will be visible in the evening to early fall be visible at sunrise at the end of the season. Throughout the autumn Venus will be visible at dawn and dusk Mars..
In the fall, you can enjoy a meteor shower. The first significant rain of autumn is the Draconic, whose maximum is given to Oct. 8. Another popular meteor shower in winter is that of the Leones , which occurs around November 17 and occasionally becomes very intense. Rain is usually stronger than the Gemini’s, whose maximum rate occurs around December 13.
Finally, with respect to clusters of stars called constellations, near the North Star will, throughout the night, Swan, Cassiopeia, Urfa Minor and Giraffe. The ecliptic constellations are visible in this period to Virgo Capricorn. Above the ecliptic highlight Pegasus and Andromeda, below, Whale and Orion and the star Sirius and Procyon.
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