The union of two meridians of longitude separated by $180^\circ$ is a great circle. Is there a particular name for these great circles that pass through both poles?
2026-03-25 01:16:53.1774401413
A name for great circles that pass through both poles
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The term polar great circle turns up in both mathematical texts (Geometry of Four Dimensions; Geometry of Lie Groups) and cartographic sites (gcmap.com: Great Circle Mapper).
Other ideas: vertical circle (an astronomical term); circle of longitude.