《汉书·纪·武帝纪》
后元元年春正月，驾至甘泉，郊祭泰山之神，随后驾临安定。
后元元年春正月，行幸甘泉，郊泰畴，遂幸安定。
On the first day of the first month of spring in the first year of Houyuan, he arrived with his carriage in Ganguan, where he offered sacrifices to the gods of Mount Tai and then visited Anding.