În timpul unei eclipse de Lună, Pământul trece între Lună și Soare, determinând Pământul să-și arunce umbra asupra Lunii. Veți observa că umbra pe care o produce este rotundă. Chiar dacă Pământul ar fi plat, dar în formă de disc, nu ar arunca nici acest gen de umbră. „Singura formă care poate produce o umbră curbată, indiferent din ce direcție este plasată lumina, este o sferă”, explică Thaller.
Climate oscillation or climate cycles are a recurring oscillation within the global or regional climates and their fluctuations produce varying climatic cells and pressures often occurring on an interannual and multi annular basis.
On a decadal and millennium timescales.Current examples of the ENSO, Pacific oscillation, Antarctica, and arctic oscillation. like ENSO is characterized by flooding and drought conditions and the distribution of extreme conditions in the form of heat and cold waves.
Other cycles like the Piora oscillation, Little ice age, medieval warm period, retreating of glaciers and warming of the planet. All these cycles move on earth from the equator to tropics to temperate to polar areas and the continuous warming and cooling periods have altered the rate of spreading of the seafloor and oceanic basin.
Present warming has drastically created a major change in the evolution of species causing extinction and quick decomposition of resources. The release of carbon and methane gases over these years have raised the greenhouse effect at alarming rates.
