落下闳在制定太初历时，改变了旧的历日制度，规定每年以孟春正月朔日为岁首，被汉武帝采用。
Luoxia Hong changed the old calendar and made the first month of spring as the beginning of a year, which was employed by Emperor Wu of han.
落下闳在制定太初历时，改变了旧的历日制度，规定每年以孟春正月朔日为岁首，被汉武帝采用。
Luoxia Hong changed the old calendar and made the first month of spring as the beginning of a year, which was employed by Emperor Wu of han.
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