What happened in the last 2 days of March?

(Baonghean.vn) - In the last two days of March, many events happened in world history, including the following 7 notable events.

1. March 30, 239 BC: Halley's Comet is first discovered

According to records, the first people to discover Halley's Comet were two Chinese astronomers, who discovered signs of a star moving at a very high speed in 239 BC. At that time, Halley's Comet had an elliptical orbit, which was on its way out of the orbit of Neptune and into the orbit of Venus. Halley's Comet was also the first comet to be discovered in astronomical history.

Image of Halley's comet.

British astronomer Edmond Halley predicted the appearance of Halley's comet, which could be observed from Earth in 1759. And his prediction came true, from that event people took the name of this astronomer to name Halley's comet.

2. March 30, 1858: Invention of the pencil with eraser

The pencil comes with an eraser.

Hyman L. Lipman invented the eraser that was attached to the end of a pencil and patented it in the United States in 1858. The eraser was made from India rubber. It turned out to be a very useful and convenient invention.

3. March 30, 1899: Invention of the horseshoe

In 1899, American inventor James Ricks improved the previous wooden or stone horseshoe into an iron horseshoe. His invention was soon patented and widely used in the United States.

His iron horseshoe design was V-shaped with a screw that could be tightened to clamp firmly onto the horse's hoof. He later tried rubber horseshoes, but they were not successful. Iron horseshoes are still widely used today.

4. March 30, 1791: Regulation of the measuring system

Did you know that 1 meter is considered to be 1/10 millionth of the distance between the North Pole and the equator?

In 1791, a number of French scientists including Borda, Lagrange, Laplace, Monge and Condorcet presented to the French National Assembly a system of measurement according to international standards. The French National Assembly then agreed to choose the metric system, which stipulated that 1 meter was the distance equal to 1/10 millionth of the distance between the North Pole and the equator.

5. March 31, 1989: Oldest dinosaur embryo fossil discovered

In 1989, archaeologists discovered a 150 million year old dinosaur egg fossil in Utah. This was the first dinosaur egg fossil ever discovered still inside a mother dinosaur, and also the oldest fossil over 100 million years old. Scientists discovered this fossil among many other dinosaur skeletons, so it is very likely that this was a dinosaur nest during the Cretaceous Period.

6. March 31, 1966: Successfully put the spacecraft into lunar orbit

In 1966, the Luna 10 spacecraft was successfully launched into lunar orbit from Earth orbit. This was the first spacecraft to be launched into lunar orbit, developed by the Soviet Union. After being launched to the Moon, Luna 10 took only 3 hours to complete its first orbit.

The spacecraft carried a gamma-ray spectrometer and a magnetometer to measure radiation and magnetic fields on the Moon. After completing 460 orbits around the Moon, Luna 10 stopped operating after running out of power.

7. March 31, 1889: Inauguration of the Eiffel Tower in Paris

In 1889, the famous Eiffel Tower in Paris, France was inaugurated and immediately became the tallest tower in the world at that time. With a height of 300m, the Eiffel Tower held this record until the Empire State Building was built 40 years later.

The tower's unique design was created by 56-year-old architect Gustave Eiffel, and his name was also used to design the tower. In the early days, the project caused controversy over its aesthetics and functionality. However, the Eiffel Tower quickly became a success, becoming the top tourist attraction in France.

Kim Ngoc

(Synthetic)