Greenwich, LondonThe Prime Meridian of the World

2D Wong Tsz Hin Donald (32)

A prime meridian is a line of longitude, at which longitude is defined to be 0°. A prime meridian and its opposite in a 360°-system, at 180° longitude form a great circle. This great circle divides the Earth, into two hemispheres. If one uses directions of East and West from a defined prime meridian, they can then be called Eastern Hemisphere and Western Hemisphere. A prime meridian is finally random, unlike an equator, which is determined by the axis of rotation — and various conventions have been used or encouraged in different regions and throughout history.

Royal Observatory, Greenwich

What is Prime Meridian?

The Prime Meridian is connected eight countries which are Britain, France, Spain, Algeria, Mali, etc.

The longitude of Greenwich is 00

There is a line of Prime Meridian in the Royal Observatory in Greenwich

The info of Prime Meridian

Why does the Prime Meridian set up at

Greenwich?

The reason for the Prime Meridian sets up at Greenwich is that finder of Prime Meridian is born in Greenwich. Therefore, Greenwich is used to be the centralization of the Prime Meridian. In 1884, the International Meridian Conference was held in Washington, the Greenwich was also elected to be the Prime Meridian for most of the countries in the world. Finally, Greenwich became the Centre of Longitude, which is also known as the Prime Meridian.

Prime Meridian

Greenwich

Royal Observatory

where

In 1884

International Meridian Conference

when whatThe 0o

longitude

How long

It is start from north polar to south polar

My reflection I want to go to the Royal Observatory in Greenwich because

their government use a line to divide it into two hemispheres. Thus I can step onto the two hemispheres at one time. If I go there, I can learn more about Prime Meridian, especially at the method of measurement at Prime Meridian.

Rio de Janeiro 43° 10′ 19″ W

Hong Kong 114° 10' 0" E

Some Countries’ longitude

Jerusalem 35° 13′ 47.1″ E

Florence 11°15′ E

Rome 12° 27′ 08.4″ E

New York 74° 0' 23" W

Tokyo 139° 45' 5" E

Greenwich 0 ° 00’ 00” W

West

HemisphereEast Hemisphere

Sources of Materials

http://en.wikipedia.org/wiki/Prime_meridian

http://en.wikipedia.org/wiki/Prime_meridian_(Greenwich)

http://education.nationalgeographic.com/education/encyclopedia/prime-meridian/?ar_a=1