meridians: are semicircles which go from one pole to the other the primer, or meridian (0º) is the poins of reference for other meridians.
parallels: are circles which are perpenticular to the meridians. The equater is the most impotan
latitude:is measured by the parallels which start at the equator (0º).At the poles they are 90º. they are north (N) or south(S) dependig on whether they are localet.
longitude: is measured by using the meridians which start at the primer merian(0º) they runvertically
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