De ratione atque emendatione anni & romani kalendari opusculum

The only work printed by Giacomo Ruffinelli at Perugia, and the only known edition of Rastellis contribution to the reform of the outdated Julian Calendar, which by the 16th century was 10 days in arrears

Item author: Bernardo Rastelli
Item date: 1579
Grant Value: 1,800
Item cost: 3,600
Item date acquired: 1995
Item institution: British Library
Town/City: London