1673 followed by 1674
1673 (MDCLXXIII) was a common year starting on Sunday of the Gregorian calendar and a common year starting on Wednesday of the Julian calendar, the 1673rd year of the Common Era (CE) and Anno Domini (AD) designations, the 673rd  year of the 2nd millennium, the 73rd  year of the 17th century, and the  4th   year of the 1670s decade. As of the start of 1673, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.