1911 followed by 1912
1911 (MCMXI) was a common year starting on Sunday of the Gregorian calendar and a common year starting on Saturday of the Julian calendar, the 1911th year of the Common Era (CE) and Anno Domini (AD) designations, the 911th  year of the 2nd millennium, the 11th  year of the 20th century, and the  2nd   year of the 1910s decade. As of the start of 1911, the Gregorian calendar was 13 days ahead of the Julian calendar, which remained in localized use until 1923.  
A notable ongoing event was the race for the South Pole.