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There is a great site thatThere is a great site that details the actual progress of the seasons as based on the quarters and cross-quarters: http://www.archaeoastronomy.com/ - it also provides an animated star clock that shows where we currently are in the orbit of the earth as of today and the tilt of the earth as it progresses through the orbital cusp point. Also, it was earlier mentioned that the tilt of the earth's axis is 23.5 degrees - that is incorrect - the current tilt of the earth's axis (as of mid-2013) is 23.439 degrees. The tilt of the earth's axis is affected by many factors, some regular and predictable (related to the precession of the equinoctes and the effecct of lunar gravity) and others unpredicatble (e.g. redistribution of mass due to earthquakes) - for instance, the great earthquakes of 2004 in the Indian Ocean basin and in 2011 at Japan in the Pacific Ocean basin actually slightly affected the tilt of the earth by moving larges masses of the Earth's material closer to the centre of the Earth. The Earth's axial tilt is currently decreasing, and may vary between 22.1 and 24.5 degrees. It is postulated that when the Earth's tilt is at the maximum point of 24.5 degrees is when ice ages typically occur - and as well, ice ages also have an effect on the axial tilt, since they redistribute large amounts of mass (i.e., ice) towards the geographic poles. The after-affect of this mass redistribution is still being felt due to crustal rebound of areas of the Earth that were under massive volumes of ice during the most recent ice age (for instance, the Hudson Bay basin in Canada is currently rebounding by close to 2cm per annum due to the removal of the Laurentian ice sheet following this most recent period of global climate warming [unrelated, BTW, to any human-induced warming of the climate]).

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