This is the story of how an 11-year-old boy, growing up in 16th-century Italy, loses his birthday when the Gregorian calendar replaces the Julian calendar in 15... » 

This is the story of how an 11-year-old boy, growing up in 16th-century Italy, loses his birthday when the Gregorian calendar replaces the Julian calendar in 1582, and how he fights to prevent this loss. The author weaves elements of the cultural and scientific milieu into the tale. «