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In Europe and above all in Italy the abundance in historical
documents, early and modern instrumental data are a unique valuable
source of climate information. In the first part, documentary data
and the Italian unexploited early instrumental observations carried
out, at the heart of the Little Ice Age, by several Galileo
Galilei's followers after the invention of the first thermometer
are presented here for the first time. These data are a unique
chance to reconstruct a temperature series covering a time twice
respect the results reported in the IPCC 2007 report. In the second
part, satellite data are used for climatic investigation applied at
site testing for astronomy. At present, the remote sensing
technique is the more effective mean to perform a worldwide survey
of different climate parameters over the already active but also
over future astronomical sites. The use of several satellite
detectors with improved spatial resolution is explored to test,
over the last decades, the unchanged sky quality characteristics in
four among the top world sites. Moreover, for the first time, it is
studied the cloud coverage and the aerosol content over a new
exploitable ELT site: Tolonchar.
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