When and why can there be 61 seconds in a minute? Detailed answer

BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Free library / Directory / Big encyclopedia for children and adults

When and why can there be 61 seconds in a minute? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

Did you know?

When and why can there be 61 seconds in a minute?

In order for UTC to more closely match mean solar time, in some years the International Earth Rotation Service adds a leap second, also called a leap second, by June 30 or December 31. On such days, after 23:59:59, 23:59:60 comes first, and only then 00:00:00 the next day.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What is second space velocity?

The minimum speed that needs to be reported to a physical body (for example, a spacecraft) so that it can overcome the gravitational attraction of a celestial object (for example, a planet or a star) and leave the sphere of its gravitational action forever is called parabolic speed (a body with such a speed moves along parabolic trajectory).

The parabolic speed decreases with increasing distance from the celestial object. The parabolic speed at the surface of a celestial object is called the second space velocity.

For the Earth, the second cosmic velocity is 11,18 kilometers per second. Parabolic speed at an altitude of 300 kilometers above the Earth's surface (sea level) is 10,93 kilometers per second, at an altitude of 1000 kilometers - 6,98 kilometers per second.

For the Sun, the second cosmic velocity is 617,7 kilometers per second, and the parabolic velocity at a distance of 1 astronomical unit from our luminary (the average radius of the earth's orbit) is 42,1 kilometers per second. For the largest planet in the solar system (Jupiter), the second space velocity is 59,5 kilometers per second, for the smallest (Mercury) - 4,2 kilometers per second.

Test your knowledge! Did you know...

▪ Who is John Calvin?

▪ What are children afraid of?

▪ What animal can get drunk just by burrowing into wet sand?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Atomic transistor 26.09.2005

British physicists have made a transistor controlled by a single atom.

A transistor is an electronic device with three pins. Two of them are included in the electric current transmission network, and a control signal is applied to the third, which either allows the current to flow between the first two, or prohibits it.

As physicists from the University of Liverpool, led by Professor Werner Hofer, have shown, such a device can be built from a molecule and a single atom.

To do this, a layer of hydrogen atoms was applied to the surface of a silicon wafer, and it became an insulator. Then styrene molecules were placed on it, which lined up in lines up to hundreds of nanometers long. Next, hydrogen was pulled from one of the silicon atoms located next to such a line, and an electric charge formed on it. After that, it only remained to attach two probes of an atomic force microscope to the ends of the molecule and pass a current between them.

It turned out that by varying the charge on silicon, it is possible to change the current strength tenfold.

Other interesting news:

▪ Luminous potatoes grown

▪ beta battery

▪ Marvell IAP220 Single-Chip System for IoT and Wearable Electronics

▪ Playing with other children affects language learning

▪ Painkillers reduce empathy

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Lighting. Article selection

▪ Article Nazim Hikmet. Famous aphorisms

▪ article When were cats tamed? Detailed answer

▪ Kariya's article. Legends, cultivation, methods of application

▪ article Features of repair of compact fluorescent lamps and electronic ballasts. Encyclopedia of radio electronics and electrical engineering

▪ article I know your card. Focus secret

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews