It has been 15 years since the day that all Americans can say their world changed, and that they will never forget.

The annual memorial service honoring the 2,606 people who died at the World Trade Center, in addition to those who perished on the planes, where Al Qaeda terrorists slammed two of four hijacked planes on September 11, 2001 in the deadliest terrorist attack on American soil is once again scheduled to take place at the former site of the once iconic towers.

The site, now a memorial and museum about the attacks has been holding a ceremony each year, where loved ones and family members of the victims read their loved ones names, starting at the same time that the first hijacked plane crashed into the North Tower at 8:40 a.m., followed by the second plane crashing into the South Tower at 9:03 a.m. Victims on the planes died immediately, and more perished following the collapse of the South Tower at 9:59 a.m. and the North Tower at 10:28 a.m.

A live stream for the 15th commemoration ceremony can be found here, and will begin promptly at 8:40 a.m. on Sept. 11.