what is meridian in English ?
while reading about measuring the earth's circumference i found that word "meridian" which I don't know which of the words :
" latitude" which is the angular distance of a place north or south of the earth's equator, or
" longitude" which is the angular distance of a place east or west of the Greenwich ,
it refers to or is it something else ?

Question

what is meridian in English ?
while reading about measuring the earth's circumference i found that word "meridian" which I don't know which of  the words :
 " latitude" which is the angular distance of a place north or south of the earth's equator, or
 " longitude" which is the angular distance of a place east or west of the Greenwich ,
 it refers to or is it something else ?

Answer

"a circle of constant longitude passing through a given place on the earth's surface and the terrestrial poles."

Answer

The Greenwich meridian is zero degrees longitude.

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