What numbers do lines of latitude and longitude start and end with?
Latitude goes from 0 to 90
Longitude goes from 0 to 180.
http://geographyworldonline.com/tutorial/latitudelongitude.jpg
On a flat map?
Yes.
The link I posted shows two flat maps of the globe.
How come on some pictures, the latitude and longitude numbers vary?
They vary because you're not looking at the whole globe.
http://adventuresinfamilyland.files.wordpress.com/2012/12/map-of-western-hemisphere.jpg?w=596
Lines of latitude, also known as parallels, are imaginary horizontal lines that run east-west around the Earth. They are measured in degrees north or south of the Equator, which is designated as 0 degrees latitude. The Equator divides the Earth into the Northern Hemisphere (north of the Equator) and the Southern Hemisphere (south of the Equator).
The latitude lines start at 0 degrees at the Equator and extend up to 90 degrees at the North and South Poles. The line of latitude at the North Pole is called 90 degrees North or 90 degrees latitude, while the line at the South Pole is called 90 degrees South or 90 degrees latitude.
On the other hand, lines of longitude, also known as meridians, are imaginary vertical lines that run north-south around the Earth. They measure the distance east or west of the Prime Meridian, which is designated as 0 degrees longitude. The Prime Meridian runs through Greenwich, London, UK.
The longitude lines start at 0 degrees at the Prime Meridian and go up to 180 degrees both east and west. The line of longitude opposite to the Prime Meridian and passing through the Pacific Ocean is called the International Date Line and is designated as 180 degrees East and 180 degrees West longitude.
To summarize:
- Lines of latitude start at 0 degrees at the Equator and go up to 90 degrees at the North and South Poles.
- Lines of longitude start at 0 degrees at the Prime Meridian and extend up to 180 degrees both east and west, with the International Date Line at 180 degrees.