NASA astronauts, political leaders and members of the Armstrong family will attend a public memorial today for Neil Armstrong, the first man to walk on the moon, who died on August 25.
The service will be held at Washington National Cathedral , which is known as the spiritual home for the nation.
The first man to walk on the moon, Neil Armstrong, will be buried at sea. The astronaut was a Navy fighter pilot before joining the space program. He flew 78 combat missions off an aircraft carrier during the Korean War. Mr Armstrong asked to be buried from an aircraft carrier.
President Obama has paid tribute to Neil Armstrong, calling him "one of America's greatest heroes".
The former astronaut, who became the first man to walk on the moon, has died at the age of 82.
ITV News reporter Martha Fairlie reports:
Celebrities used Twitter to pay their respects to Neil Armstrong, including Simon Pegg, Richard Branson and Jamie Bell.
Just heard Neil Armstrong took the giant leap. RIP a true modern hero and conqueror of the moon. Will be ever remembered.
RIP Neil Armstrong. My first inspiration to try to make space travel possible for all. A hero for anyone who looks to the stars & dreams
Very moved at the news of Neil Armstrong. Inspired me constantly through my life. Once more he's slipped the heavenly bonds of earth. #RIP
Footage of Neil Armstrong walking on the moon, and saying the famous line of "one small step for man, one giant leap for mankind."
In this 1969 photo, Neil Armstrong smiles having just completed his historic moonwalk.
He took the 'one small step' that was mankind's greatest leap in history. NASA's most celebrated astronaut Neil Armstrong left his mark on space exploration.
ITV News' Washington Correspondent Robert Moore reports:
Dr Francisco Diego, vice president of the UK Association for Astronomy Education, talks to ITV News about astronaut Neil Armstrong's legacy.
In this 1969 photo, Neil Armstrong practices in a lunar module simulationfor the Apollo11 mission that was later the same year