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...uinox. Sometimes in the study of [[Milankovitch cycles]], the [[invariable plane]] of the solar system is substituted for the moving ecliptic. Longitude may ...e]] is that pole of rotation that lies on the north side of the invariable plane of the solar system (the [[ecliptic]]). The location of the prime meridian

| of the image vary during that time, in one part it must be invariable, it | might wander, projecting long slender fabrics from plane to plane of ever rarer