Relating to or surrounding the meridian (an imaginary line from north to south), or occurring near the time of meridian passage.
From circum- (around) and meridian (from Latin meridies, midday or noon). The term is used in astronomy and surveying.
Astronomers use circummeridian observations to determine exact latitude and longitude—by watching a star pass around the meridian, they can pinpoint location on Earth more accurately than GPS alone.
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