The range of latitude between the north pole and south pole is 180 degrees.
You're free to draw as few or as many lines in that range as you feel you need.
Some maps and globes have many lines printed on them, some have only a few,
and some have no lines at all. My mapping software will print 324,000 lines of
latitude on the screen if I think I need them. There is no standard set of 'lines'.
Your question is a lot like asking "How many lengths are there on a ruler ?"
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There are 180 degrees of latitude in the world. 90 are in the north, and 90 are in the south. As for longitude, there are actually 359 degrees, not 360 like others believe. This is because the Prime Meridian is counted as 0 degrees, so there are 179 lines of longitude on either side. So do the math: 179+179=358, and if you count the Prime Meridian, 358+1=359.
There are none on the Earth's surface, and no longitude lines either, because the whole
coordinate system is one of definitions, and it deals only with imaginary lines that are
not actually there. You'll only find them on some printed maps and globes ... just like the
names of cities and countries, which are not marked on the real Earth either.
Now, if you want to know how many imaginary latitude lines there are, that's like asking
how many marks there are on a ruler. It depends on the ruler, they're not all the same,
and there's no official, standard set of marks. In the same way, there are 180 degrees
of latitude between the north pole and the south pole, and you can draw a line at any
latitude you want to. Some globes have lines every 30 degrees, or every 15 degrees,
or every 10 degrees. But it depends on the map or globe. They're not all the same, and
there's no official, standard set of 'lines'.
There are an infinite number of latitudes. Conventionally they are broken into degrees, minutes and seconds of arc. This system would limit the number of latitudes and the accuracy of describing a position. Increasingly they are expressed as decimals and consequently can be an infinite number of them.
Latitude, is the angle from the equator, to a point on earth, towards the poles.
The angle from the equator to either of the poles is 90 degrees. So that is the maximum angle a Latitude can be.
Latitude has to be named either North or South (of the equator). latitude is used in combination with Longitude to indentify a position on the earths sphere.
If you join all points that are the same angle from the pole, they form a ring around the earth.
Each different angle produces another ring parallel to any other. That is why a latitude is referred to as a 'Parallel'.
You can subdivide angles into any amount you want. Angles use the rule of 60.
There are 60 minutes in a degree, there are 60 seconds in a minute of arc and after that you can use decimals of a second.
There are 180 degrees of latitude in total, with 90 degrees each in the northern and southern hemispheres.
90 degrees north of the equator, and 90 degrees south of the equator.
Total: 180 degrees, from pole to pole.
There is an unthinkable number of latitude lines, but there are 2 MAIN latitude
lines.
15 degrees north, 30 degrees north, 45 degrees north, 60 degrees north, 75 degrees north, 90 degrees north. ( The last person had put here 180 degrees north. If you look at many other info online, you will find it's actually 90 degrees north, not 180. Also, if you relate beginner geometry and the shape of angles....the equator, horizontal line, straight up to the north pole, is a 90 degree angle. hence the 90 degrees north parallel.)
Meridian is another name for longitude. It refers to the imaginary lines running from the North Pole to the South Pole on the Earth's surface, used to measure east-west positions.
In order to travel through all possible latitudes, you'd have to travel all the waybetween the Earth's poles. That's half-way around the globe, or 180 degrees.
Degrees of latitude run east and west around the globe. They are also called parallels of latitude.
There are a great number of swamps at many latitudes from about 30S to 45N.