geography

• Earth experiences two different motions, rotation and revolution
• earth rotates on its axis
• when the sun is shining on the earth that is called daytime.
• when there is no sun shining it means its night-time
• every country on earth pass through these 4 points: morning, afternoon, evening and night
• time zones are divided by imaginary lines called meridians
• meridians run from north to south pole
• there are 24 time zones
• the imaginary line running through the UK is called the Prime Meridian or Greenwich Meridian
• the Greenwich meridian splits the world into northern and western hemispheres
• time in countries to the east of the Greenwich meridian are always in front of that in the UK.
• time in countries to the west of the Greenwich meridians is always behind
• the IDL is the international date line
• the IDL is on the opposite of the earth to the Prime meridian
• the prime meridian is used to define Universal time and is the meridian from which all other time zones are calculated
• The purpose of the IDL is to complete the 24 hour per day cycle and provide the start of a new day
• if you cross the Idl travelling eastward you lose a day
• if you cross the IDL travelling westward you add a day
• the idl passes through the middle of the pacific ocean
• the idl is an imaginary line on the surface of earth that runs from the north to the south pole and demarcates one calendar day from next