Francesco Fontana
With a Fontana's telescope , the Jesuit Giovanni Battista Zupi observed for the first time in 1630 the horizontal bands on the atmosphere of Jupiter and in 1639 the phases of Mercury , an evidence , together with the phases of Venus observed by Galileo in 1610 , that the Copernicus's heliocentric theory was correct . 
<triplet> 1630 <subj> 1630 <obj> point in time <triplet> 1639 <subj> 1639 <obj> point in time