Giovanbatista Odierna was an early observer of Jupiter and Saturn and one of the first to discover and describe nebulae. He was the son of Art Vita Dierna, who was either a mason or a shoemaker according to different sources, and Serafina Rizo. Very probably, his family lived under inferior, more probably poor conditions. While mostly referred to as Odierna, it seems that the man himself always used "Hodierna" as his name; it is not completely clear why and how he changed the name.Odierna was self-educated, at least in science. As a young man, he observed the three comets of