SUNDIALS. ‘Regulae sive numeri Pro solariis horologiis’, manuscript, mid-17th century. Text on 3 leaves, tables of latitude and of the Italian hours on 3 leaves, tables for calibration of sundials on 264 pages, 19 figures of sundials throughout the text (one loosely inserted), the endpapers and text enthusiastically annotated by a contemporary hand, including the addition of tables and figures. In Latin, altogether approx. 318 pages, 133 x 90mm. Contemporary sheep (worn).