Greening standard time

Introduction

Earth's daily rotation is some irregular, and is slow and slow down. Therefore, Greening time is no longer used as standard time. Now the standard time - coordinates the world (UTC) - is provided by the atomic clock.

Since February 5, 1924, the Greenwich Observatory will issue time-time information to the world every hour.

Observatory

walk into the Observatory, first seeing is the famous primary child, which is an internationally recognized Earth zero-degree cable. That is actually a metal wire buried on the ground, indicating the world of major cities around the world to be based on the metrology. The tourists bustle, they took a photo in the small courtyard, and looking for the name and longitude symbol of the city in the city. Many people also take this out of this cross.

The observatory will have a lecturer in the British Medieval clothing every day to explain the Greenwich standard time. According to him, in addition to the average value of the number of days, the time this measurement is called an average time.

The observatory is free to the public, but you need to visit the Tianshen Museum to spend £ 4. In the Tiansheng Mall, you can see watching a day from various era, and my country's ancient times is also in it. Walking between a variety of clocks, you will have a feeling of walking around the world. Tourists only need to spend a pound, you can get a certificate in printed on the time of the Greenwich Time at the time, prove that you have "here".

Area authority

is interesting, because Greening Town is part of London, so the local people are subject to London. London will use summer time to use in the last half of the year, so the London time is more than one hour than the Greenwich time. Only in the winter months, London time is still coincident with Greenwich.

In order to commemorate the glory of the past, a red sphere is retained on the top of the Greenwich three-storey building, and the Greenwich time is 13 o'clock every day, this time ball will fall on time. The ship on the Thames is on the table.

The authority of the Greenwich Observatory in the field of timing is not faded over time. In the 1990s, countries around the world should start a debate from 2000 in 2000 in 2000. Finally, it was also the Greenwich Observatory of "Delgadia", issued a news announcement in March 1996, and announced that the 21st century should start with this storm.

overlooks London overlooking London, a new giant building is in the eyes - that is the famous millennium dome, the British welcomes the 21st century celebration site. Every night, the laser emitted from the Greenwich Observatory from the Grinity Observatory is particularly clear in the night, and the pen is moved to the millennium, which seems to be reminding people, here is the starting point of the world time.

Greenfire

A region of the original longitude in the Lation of British England, the original. The original translation Greenwich. Located in the south shore of the Thames, with the North Bank Town Tunnel and Highway. In 1423, the Duke of Gloster was built on the Greening Park, built a look at the hillside, and then built the Greenwich Royal Observatory. In 1694, the Naval Hospital was built, and the Royal Navy College was reformed in 1873. The original site of the observatory is changed to a part of the National Navigation Museum. The Greenwich Terminal is stopped from the Gypsy Moth of the Gypsy Moth and the short shark to teach sailboats. The starting point of Greenwich, the world calculation time and geography is located 8 kilometers southeast of the city center of London. The terrain is dangerous, the scenery is beautiful, and the starting point of Greenwich, the world is calculated, and the geographic tight is located 8 kilometers southeast of the city center of London. The terrain is in danger, the scenery has built a palace in the century, and the fortune watching tower is set up, and the big mountain forest is used as a royal family as a defeater, the eagle and hunting.

In 1675, King Charlie II was decided to build a lookout tower to build the British King's Greening Observatory.

In 1884, astronomical workers in more than 20 countries in the world held a meeting in Washington, USA, officially confirmed to zero the zero line from the moon from the Chinese star instrument of the Astronomy, and the east, weighing the West Each is 180 degrees. Each 15 degrees is one time zone, and the adjacent time zone is different from 1 hour. On the brick wall next to the Observatory, the big clock of 24-hour flies, the time it indicated is the "Greenwich Time" commonly used by the world. Since then, Greening is famous in the world. With the development of astronomical observations, the Tianminbai Building has accommodated a lot of modern equipment, and Greening has been connected to the city of London, and the urban environment has an impact on the observation of the weather climate. In 1948, the British government decided to move the Observatory to Hesmont, southeastern England, but still referred to in the future of Wang Jia Greening Observatory. Here, there is a telescope including a diameter of 2.49 meters, an atomic clock, which is accurate to one billion seconds. The old site of the Observatory is called a museum, and people can see the telescopes, astronomical clocks, and sky map of the observatory. The picture shows the exterior of the antennaette new site that is rebuilt on the basis of Herstermontsu Castle.

Zero lunch

Zero lunch line is also known as "first child" or "the primary child", is the calculation line of calculating long on the earth. The development and use of this junior meridian is changed. Greenwich Time The Ji Phase 19th century ago, many countries adopted a mid-loon through the Atlantic Nabali Islands. That mid quite is equivalent to today's West 7 ° 39'46. In the 19th century, many countries were this primary and meridian with the meridian of the main observatory through the country. In this way, there are several primary meridies in the world. It has brought many inconveniences to the lame in 1884, and the International Classical Conference decided to pass the British Greenwalk Eric's Er. This junior meridian is the calculation line of global longitude. The longitude value begins with the primary child, respectively, the east, Western count, 0 ° -180 ° or from 0-12.

This junior meridian is east, we we want to weef, global longitude measurements are used as a longitude of the intensity of the intersection with the intersection of the primary meridian and the equator. After 1957, the Greenwich Observatory migration site, internationally retrofitting several long-term stable obvious observatory to maintain the original point, and the original longitude of these observations refused to deviate from the origin of the same. Then determine and maintain a bit of the origin of the global longitude by the average and the difference between the origin origin and the difference. The original point of the International Agreement (CIO) as the origin of the origin, called the moon from the origin of the International Agreement Original and the origin of the Observatory "of the Jianzi". The longitude zero points of the various new technologies determined by the Earth coordinate system are as consistent with the mid quarter, but there is often less than 1 〃 zero difference.