there are ninety lines in each hemisphere
There are 90 degrees of latitude in the northern Hemisphere, and another 90 in the
southern one.
There are 180 degrees of longitude in the eastern Hemisphere, and another 180 in the
western one.
In each hemisphere, you're free to draw as few or as many lines in that range
of numbers as you want to see. There's no standard set of 'lines' that everybody
must use. Some maps and globes have more lines on them, some have fewer,
some don't have any at all.
Would you go into the hardware store and ask the man "How many lines are there
on the tape measure ?" ?
The longitude lines are always the same distance from each other.
Each 'meridian' is a line of constant longitude.
Lines of longitude and latitude cross each other and denote the absolute location of the area crossed by the coordinates. Each area on earth has it own absolute location.
Lines of constant latitude are all parallel to each other.
Lines of longitude, called meridians, run perpendicular to lines of latitude, and all pass through both poles. Each longitude line is part of a great circle. There is no obvious 0-degree point for longitude, as there is for latitude. If any line is north or south it has to be latitude, because longitude goes all the way around the earth, from pole to pole.
The longitude lines are always the same distance from each other.
Each 'meridian' is a line of constant longitude.
Lines of longitude and latitude cross each other and denote the absolute location of the area crossed by the coordinates. Each area on earth has it own absolute location.
Lines of constant latitude are all parallel to each other.
Lines of longitude, called meridians, run perpendicular to lines of latitude, and all pass through both poles. Each longitude line is part of a great circle. There is no obvious 0-degree point for longitude, as there is for latitude. If any line is north or south it has to be latitude, because longitude goes all the way around the earth, from pole to pole.
The northern and southern Hemispheres each comprise 90 degrees of latitude. On your map or globe, you're free to draw as few or as many lines as you'd like to see in that range. There is no standard set of 'lines'.
Meridians of constant longitude cross parallels of constant latitude. Parallels of constant latitude cross meridians of constant longitude. At each intersection of a meridian and a parallel, the lines are perpendicular (form 90° angles).
Each line of latitude (the ones parallel to the Equator) crosses each line of longitude (the north - south lines).
Not quite. Lines of latitude are called parallels, and they never touch each other. The meridians are lines of longitude, and all of them converge at the poles.
On maps, lines of latitude divide the Earth into "rings" of mainly 18 parts with each "ring" having 10 degrees latitude. Lines of longitude then cut across the lines of latitude and thus forming grids. There are mainly 36 lines of longitude spaced at 10 degrees longitude apart. In the end, there are 648 grids on a map if split up in this way.
Lines of Latitude encircle the Earth horizontally, and are parallel to the Equator. Lines of Latitude are intercepted by Lines of Longitude. Lines of Longitude run vertically from the North Pole to the South Pole. The Prime Meridian is zero longitude and passes through the Greenwich Observatory, Greenwich, London, England.
-- All lines of longitude meet at the north and south poles. -- No two lines of latitude ever meet or cross each other. -- Every line of longitude crosses every line of latitude. -- Every line of latitude crosses every line of longitude. -- There are an infinite number of each kind, so there are an infinite number of places where a line of longitude crosses a line of latitude. (That's kind of the whole idea of the system.)