Autumnal Equinox 2010
September 20, 2010 by staff
Autumnal Equinox 2010, The balance between the forces of darkness and light was restored on Thursday as the autumnal equinox. This is the point where the Sun’s position along the ecliptic crosses the Ecuador, making the length of daylight and darkness to be approximately equal from pole to pole. This can vary slightly in reality, due to the corresponding positions in time zones, fasting sun, and the equation of time. Keep in mind, such as full or new moon, the equinox is also a moment in time. From now on until the December solstice, the nights get shorter in the Northern Hemisphere and the days lengthen in the south. Catch sunrise or sunset today, and looking exactly the point that should be east or west of the range, respectively. The cross moment of the equinox September 23 3:09 universal. geostationary satellites also tend to experience disruptions in the days before and procedure of the equinoxes, as the radio noise sun passes directly behind them for a period each day. Bring in the dark!
The week is astroword of Milankovitch cycles. Each student Earth Sciences learns that this combination of orbital and axial variations is connected to a long-term change of climate on Earth. First postulated in 1920 by Milutin Milankovi?, Milankovitch cycles include changes in the Earth’s axial tilt from 22.1 to 24.5 degrees, the precession of the poles more than 26,000 years, the changes in the eccentricity of 0.005 to 0.028, and the precession of the apse of the orbit of the Earth more than 25,000 + years. This can lead to mild seasonal variations when these aspect ratios are at a low value (ie, say that a low eccentricity, axial tilt of low value, and the perihelion / aphelion coinciding with the equinoxes), with large seasonal variations when these perimeters increase. Currently, its aphelion in July falls during the northern summer, the eccentricity is a value of 0.017 (about half) and the axial tilt is 23.44 degrees (a script at the top) and decreasing. That we should provide for temporary workers improved in the northern hemisphere summer and winter climate hardest in the southern hemisphere, ie whether the effects of anthropomorphic climate change and global dimming are not taken into account. These effects include dramatically recently introduced climate evolution over time, and it is feared that all natural safety valves as global dimming may mask the true impacts of emissions of greenhouse gases until it is too late. Currently, the northern hemisphere autumn is one of the shorter seasons, scoring in the not-so 90 days. It’s a complex world out there, and understanding of the interaction between Milankovitch cycles and the impact of human activity will go a long way in our development as a species ripe planning.
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