What is the human moon day?

"Man's Moon Landing Day" is on July 20th every year, in order to commemorate1July 20th, 969, when man landed on the moon for the first time. Let's take a look.

First of all, the process of landing on the moon

The landing site of Apollo 1 1 is in the south of MareTranquillitatis, 20 kilometers southwest of Sabinde ring. This landing site is chosen because it is relatively flat (according to the information provided by Ranger8, Surveyor5 and LunarOrbiter), so it will not cause much difficulty in landing and extravehicular activities. After landing, Armstrong called the landing site "Jinghai Base".

UTC 1969, 18: 1 1UTC, the lunar module with the call sign "Eagle" was separated from the command module with the call sign "Colombia". 1On July 20th, 969, the first man successfully landed on the moon. Collins stayed alone on the Columbia and carefully checked the eagle's rotation around the vertical axis to make sure everything was all right. After the inspection, Collins made a simple farewell gesture-"Take care"-and left. Collins' mission is to stay in the command module and fly around the moon. For the next 24 hours, he can only listen to the communication between the control center and the eagle and pray that the moon landing will be successful. If the eagle has an accident and can't take off from the moon (which is very likely), Collins will have to return to Earth alone.

Soon, Armstrong and Aldrin started the eagle propeller and began to descend. They soon realized that it was "flying over the head": when they landed on the moon, the alarm indicating that the computer was overloaded began to sound. The eagle flew four seconds longer on the descent trajectory, which means that the moon landing site will be several kilometers west of the plan. The navigation computer has several abnormal programs to alarm. At the Johnson Space Center in Houston, flight control commander Steve? Steve Bells is faced with a crucial and urgent choice-to terminate the moon landing plan (which also means to terminate the entire flight plan, because there is only enough fuel on the plane for one attempt), or to order the astronauts to act according to the plan and ignore the problems in the computer of the lunar module. Bells later admitted that he allowed Armstrong to try to land on the moon "by instinct". After paying attention to the window again, Armstrong found that they were between a rock and a hard ground. Computer failure caused them to fly over the pre-selected landing zone, and the fuel would soon run out. At this point, Armstrong chose to manually control the lunar module. The lunar module kept descending, and the fuel began to run out-the lunar module was about 9 meters away from the surface of the moon, and the remaining fuel was only 30 seconds-Armstrong calmly found a place suitable for landing on the surface of the moon covered with rubble and craters, and drove the lunar module to land on the moon smoothly. The exact landing time is July 20th, 0969 at 65438+4: 00pm (Houston time).

Second, the development history

1On October 4th, the Soviet Union launched an artificial satellite, becoming the first country to go into space. The success of the Soviet Union shocked the West and triggered the Cold War space race with the United States.

1 959 65438+1On October 2, the moon1was successfully launched from the Baikonur launch site in the Soviet Union and then left Earth orbit. This makes it the first spacecraft successfully launched by human beings to get rid of the earth's gravitational field. 1 959 65438+1On October 4th, the moon1passed the moon 5995 kilometers away. The ultimate fate of the moon 1 is to become the first man-made planet, which will revolve around the sun forever in a period of 450 days.

1September 1959, Lunar 2 was launched,1September 4-Soviet Lunar 2 became the first spacecraft to land on the moon. Three weeks later, another unmanned spacecraft, Lunar 3, sent back the first picture of the moon.

On May 25th, President Kennedy called on Congress to support the manned moon landing plan before the end of this decade.

1February 20, 962-Glenn became the first American to fly around the earth.

1964 July 3 1- In particular, No.7 became the first American spacecraft to land on the moon, and sent back photos of the surface of the moon before landing.

1February 3, 966-The Soviet Moon 9 made its first controlled soft landing and sent back photos of the moon's surface.

From April to May, 1966-Lunar 10 made its 460th flight around the moon and played the Internationale to the the Communist Party of China (CPC) Party Congress held in Moscow.

1 June 2, 966-Explorer1Became the first American spacecraft to make a soft landing on the moon.

1September 1968 18-zond5 orbited the moon, becoming the first spacecraft to successfully return to Earth and land in the Indian Ocean.

1968 65438+February 2 1 27-apollo 8 realizes the first manned flight around the moon.

1July 20th, 969-American Armstrong became the first man to land on the moon, calling it "a giant step for mankind".

1970 April11-The United States was forced to suspend the Apollo 13 mission to the moon.

1971July 3 1- Apollo 15 crew use the lunar rover.

19721214-Apollo 17 became the last manned spacecraft to leave the moon, and the Germans became the last person to leave footprints on the moon.

Third, it has an impact.

Landing on the moon is the first step for human beings to explore outer space. As Armstrong said, this is one small step for individuals, but one giant step for mankind. Man's landing on the moon provides reference value for exploring moon resources and immigrating to Mars, which is of great significance to the history of human exploration of space.