Unfortunately this is no longer updated on thetvdb.com or on tvmaze.com (where we get schedules from).
Masterpiece is aired as three different series. Initially, "Masterpiece Classic" aired in the winter and early spring, Masterpiece Mystery! in the late spring and summer, and Masterpiece Contemporary in the fall. In later seasons, particularly after an increase in funding for WGBH and Masterpiece, the scheduling became more random. Currently, all three programs air at any time throughout the year, and on nearly half the Sundays, two episodes from two different miniseries will air on the same night.