"Our position checks downrange show us to be a little long."

Neil Armstrong realises he'll miss the target landing site.

Before the launch, he wrote a checklist of lunar landmarks and has been timing their appearance from his view from the window.

Eagle is moving faster than expected, so Guidance Officer Steve Bales alerts his boss.

If its speed increases by much more, they’ll have to abort the mission.

Staff assess the data available.

Michael Collins - often called the "third man" in the Apollo 11 mission - is on the Columbia command module orbiting the moon.

He has reassuring words for mission control: "You should have him now, Houston."

"Columbia, Houston, we've lost them.”

Charlie Duke is capsule communicator - he's in mission control acting liaising with the astronauts in space.

Just 20 seconds into the descent, the communication link between the lunar module and his team in Houston breaks down.

Image source, Getty Images

"Ignition.10%."

Buzz Aldrin's words mark the start of Eagle's final descent to the Moon, four days after the astronauts left Earth.

Follow the live stream above to experience the crucial 13 minutes that took humans to the Moon, 50 years ago, minute by minute.

When you listen to the recording of mission control and the astronauts descending to the Moon, you may hear a number of unfamiliar acronyms and expressions. This explains some of the more common ones:

ACA out of Detent - Attitude Control Assembly. Essentially it’s Aldrin saying he’s stopped the thruster jets from firing which control Eagle’s orientation.

CAPCOM - Capsule Communicator

Delta-H - A critical measurement of Eagle’s altitude for the landing attempt

EECOM - Electrical, Environmental and Communications Officer

FIDO - Flight Dynamics Officer

GNC - Guidance, Navigation and Controls Officer (pronounced: Gin-see)

Go/no Go - A call from a flight controller to state whether their systems are functioning well enough for the mission to proceed

MSFN - The Manned Space Flight Network

P64 - Computer program that will guide the crew through the landing site approach phase

PDI - Powered Descent Initiation

Slew - A particular setting for the spacecraft communications system. It enables the high gain antenna to be moved, in an attempt to get the best line of sight with Earth

Yaw - Side to side movement of the spacecraft in the horizontal plane

There's also a guide available to some of the key figures from the Apollo 11 mission.

Pink Floyd’s 1973 album may have popularised the term The Dark Side of the Moon. But those in the know call it the "far" side, referring to the part of the moon that is always facing away from Earth.

It was significant during the Apollo space programme, because when astronauts were on this side of the Moon during their orbit, they were unable to communicate with mission control. The Moon was blocking the signal between the spacecraft and earth.

The Apollo 8 mission, just eight months before Apollo 11, marked the first time a crew travelled beyond Earth’s orbit and actually travelled around the Moon for the first time - further from Earth than anyone had ever been before. Nasa called this TLI or trans-lunar injection; inserting spacecraft into the orbit of the moon.

Image source, Nasa

It was a bold mission, and the three astronauts on board - Frank Borman, James Lovell, and William Anders - had to face questions from the media about whether they feared getting lost in space. But they succeeded, paving the way for the Apollo 11 route, and providing the world with one of the most famous photographs ever taken, Earth Rise.

In orbit 60 miles above the moon, Neil Armstrong and Buzz Aldrin begin preparations for their descent to the lunar surface.

They’re on board Eagle – the lunar module which has just separated from the command module, Columbia.

Watching Eagle drift slowly away from him is the pilot of the command module, Michael Collins, who says farewell to his commander.

When he sealed Armstrong and Aldrin into the lunar module, he knew that he might be the last person to see them alive.

If something catastrophic happened – he would have to return to earth alone.

It was a device the world had never seen before. The Apollo guidance computer was the electronic brain that navigated the spacecraft to the lunar surface; without it we may never have landed humans on the Moon.

Image source, Draper

Much like auto-pilot mode on an aeroplane, the computer could control the craft’s speed and direction of travel.

Image source, Draper

Two-digit commands were punched into a keypad that looked like the pad on a microwave oven - there was no computer screen. The computer would then generate a code that the astronauts had been trained to interpret.

Image source, Draper

One of the secrets to the device’s success was its size and simplicity. Before, computer mainframes had been the size of buildings. Apollo’s computer was the size of a couple of shoe boxes, but still very powerful.

But communicating with the computer from Earth was a lengthy and difficult process.

It required a large team - mainly made up of women - to turn hand-edited code on stacks of paper scattered across the control office into punch cards.

The large computers would relay the information off the cards and send it to the Apollo guidance computer. It was vintage programming and heralded the dawn of the computer and digital age we sometimes take for granted today.

Image source, Nasa

Born Edwin Eugene Aldrin Jr in 1930, Buzz would always find himself in an orbit of adventure.

He studied mechanical engineering and went on to fly in the Korean War before being selected by Nasa for the Apollo programme.

Image source, NASA

Buzz Aldrin’s role in the Apollo 11 mission extended further than being the second person to set foot on the Moon.

As well as piloting the lunar module, he pioneered docking and rendezvous techniques for spacecrafts and introduced underwater training methods to help astronauts prepare for zero-gravity situations.

Image source, NASA

Buzz Aldrin would go on to start his own business, feature in cameo film roles and even star in a rap song with Snoop Dog.

He is an advocate for space programmes aiming for a return to the moon and human visits to Mars.

Apollo 11 astronaut Michael Collins is certain that his commander, Neil Armstrong, was the right person for the job.

Karl Garver emailed BBC Mundo to share his memory of watching the Moon landing.

Image source, Karl Garver

Image source, Twentieth Century Fox

Starting in the 1930s, Nasa employed a large pool of female mathematicians to work as "human computers". Nasa recruited African-American women to these roles during World War Two, but unlike other organisations, kept these women on when the conflict finished.

When the first digital computers were incorporated into the space programme, these women went on to become some of Nasa’s first coders and programmers.

Image source, NASA

One of these women, Katherine Johnson, external, joined Nasa in 1953, as portrayed in the in the 2016 film Hidden Figures. Johnson is best known for calculating the trajectory of the first American in space in 1961 and did the same for the Apollo 11 mission.

In 2015, Katherine Johnson was awarded the Presidential Medal of Freedom, America’s highest civilian honour, by President Barack Obama.

"I counted everything,” she said. "I counted the steps to the road, the steps up to church, the number of dishes and silverware I washed… anything that could be counted, I did."

"You know, there's an old saying in aviation that 'if it looks good it flies good.' And this [the lunar module] has to be the exception to the rule," said Neil Armstrong in an interview with CBS, external in 2005.

"Because it flew very well. But it is probably the ugliest flying machine that was ever designed."

It took two spacecraft to complete the Apollo 11 mission, launched together on top of the gigantic Saturn V rocket. One was the command and service module - Apollo’s mothership, Columbia - where Michael Collins remained for the duration.

The second spacecraft was the lunar module, called Eagle, which took Neil Armstrong and Buzz Aldrin down to the surface.