The memorial service for the first man to walk on the surface of the moon will be held at the Washington National Cathedral on September 13 at 10 a.m. ET.
The service will be broadcast live on NASA Television and will be streamed on the agency's website, as well as the National Cathedral's website.
NASA footage - See Neil Armstrong take first steps on the moon
The service will be open to the public on a first-come, first-served basis, but reservations are required. Reservations must be made through NASA.
A private service was held for Armstrong in Ohio. He died on Aug. 25 from complications resulting from cardiovascular procedures.
Armstrong commanded the Apollo 11 spacecraft that landed on the moon July 20, 1969. Half a billion people watched a black-and-white TV image as he backed down the ladder of the lunar landing ship, planted his left foot on the moon's surface, and said, "That's one small step for a man, one giant leap for mankind."
Read national reactions to Neil Armstrong's death
The Associated Press contributed to this report.
