Question

what is a meridians​

Answer 1

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$<font color="orange"><i>$A (geographic) meridian (or line of longitude) is the half of an imaginary great circle on the Earth's surface, terminated by the North Pole and the South Pole, connecting points of equal longitude, as measured in angular degrees east or west of the Prime Meridian.
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Answer 2

the vertical parallel imaginery lines on earths surface, which divide the earth into small intervals, are called the meridians.