The imaginary lines that form the earths grid system are called latitude and longitude lines. Latitude lines go horizontally from east to west, where longitude lines go vertical from north to south.
coordinate grid
Lines of latitude are imaginary lines that run parallel to the equator and form part of a grid used to describe where on the earth you are. They are often called parallels.
The lines on a map that form a grid system are called latitude and longitude lines. Latitude lines run horizontally and measure distance north and south of the equator, while longitude lines run vertically and measure distance east and west of the Prime Meridian.
The axes.
axesaxes
they are perpendicular.
To plot straight and curved lines on it in the form of equations
If you pick a longitude and mark a dot at every point on Earth with that longitude, the dots will form a line between the north and south poles. The imaginary line is called the "meridian" of that longitude.
That could be a description of the parallels of latitude. They're not only invisible, they're also totally imaginary.
A constellation of stars is a group of stars positioned in such a way that a person may see them with imaginary lines connecting them to form an image. An example is the signs of the zodiac.
axes or, singular, axis.
they form above earths surface (THIS ANSWER IS NOT CORRECT) They Form BELOW earths surface(: