oblique meridian

oblique meridian

[ə′blēk mə′rid·ē·ən]
(mapping)
A great circle perpendicular to an oblique equator; the reference oblique meridian is called the prime oblique meridian.
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And when discussing attempts to adapt the technology of portolan charts to the open oceans, he confuses the function of the oblique meridians found in extreme northern latitudes on some charts as providing a correction of scale, when in fact these oblique meridians were a (misguided) effort to correct for direction in these latitudes.

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