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Precession Earth spins like a giant top, but it does not spin upright relative to its orbit around the Sun. You can say either that Earthâs axis is tipped 23.5°from vertical…

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Upgrading DAMA/LIBRA R. Cerulli INFN-LNGS Congresso Nazionale SIF Bologna, 20-24 Settembre 2010 DAMA/R&D DAMA/LXe low bckg DAMA/Ge for sampling meas. DAMA/NaI DAMA/LIBRA…