The Seventh-day Adventist Church (commonly abbreviated SDA or Adventist) is a Christian denomination which is distinguished by its observance of Saturday,the original seventh day of the Judeo-Christian week, as the Sabbath, and by its emphasis on the imminent second coming of Jesus Christ. It is the eighth largest international body of Christians. The denomination grew out of the Millerite movement in the United States during the middle part of the 19th century and was formally established in 1863. Among its founders was Ellen G. White, whose extensive writings are still held in high regard by Seventh-day Adventists today.