The 180° longitude line passes through the middle of the Pacific Ocean from the north to south poles. The International Date Lines roughly follows the 180° longitude line but deviates to pass around some territories and island groups. The 180° longitude line passes through island groups (Fiji, Aleutian Islands) and the easternmost part of Russian Siberia.
The international date line roughly follows the 180° longitude line in the Pacific Ocean. When you cross this line from west to east, you advance one day, and when you cross from east to west, you go back one day.
The 180 degree line of longitude is called the 180th meridian or the antimieridian. This line is 180 degrees east or west of the Prime Meridian such that longitude at 180E and 180W is the same line. The International Date Line basically follows this line from the North and South poles..
Mainly the 180 degree line.
180
It is logically the 180 degree line of longitude (halfway round the planet from the Greenwich Meridian). However, politics and pragmatism have resulted in a line that is not a line of longitude but an imaginary line (with kinks in it) called the International Date Line. The kinks exist because it would be strange for an Island Nation to have two islands in different days. Thus while the International Date Line sort of follows the 180 degree longitude line it does not do so and therefore is NOT a line of longitude.
180 degrees east/west longitude
The International Dateline approximately follows the meridian of 180° longitude.
If two travellers 'A' and 'B' started from the Prime Meridian (zero longitude). 'A' travelled to the West, and ''B travelled to the East, they will meet on the other side of the World at 180 degrees longitude. Therefore, the biggest number is 180 degrees longitude. The International Date Line roughly follows the 180 degrees longitude north-south line on the Earth.
90 degrees west
The equator is mapped out to be positioned as the 0º line of latitude.
The eastern and western ones are.
The 180 degree longitude is often miscalled international date line, when it is actually called the Anti Meridian.The date line is not a meridian or line of longitude because it is not a straight line as it deviates to separate geographical places, certain island groups for instance.See the link below for an image.The longitude that runs through Greenwich England is the prime meridian, which is 0 deg longitude.