The US will honor the late former President Jimmy Carter, who died at age 100 on December 29. President Joe Biden declared January 9 as a day of mourning in an executive order – the same day as his official state funeral at the Washington National Cathedral.

Stock market closures are rare outside of regular holidays. Other events that closed the market include Hurricane Sandy and the September 11 attacks.

Stock markets and the Postal Service will be closed on January 9 to mourn the death of Jimmy Carter. Here’s what else to know about the National Day of Mourning.