true meridian

true meridian

A great circle through the geographical poles, distinguished from magnetic meridian, grid meridian, etc. See meridian.
References in periodicals archive ?
Overruling Michigan's exceptions to the report and recommendation of the special master assigned to the case, the Court held that the "boundary line between the States of Ohio and Michigan in Lake Erie follows a line drawn from the point in Maumee Bay where the north cape of that bay was located in 1836 on a course having a bearing North 45[??] East measured from a true meridian, passing over the center of the existing circular concrete seawall on Turtle Island and continuing on the same course through the lake to the point where it intersects the boundary line between the United States and Canada." When the lawsuit was over, Ohio was left with roughly two-thirds of the island.