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Emic vs Etic
Wikipedia

In anthropology, folkloristics, and the social and behavioral sciences, emic and etic refer to two kinds of field research done and viewpoints obtained: emic, from within the social group (from the perspective of the subject) and etic, from outside (from the perspective of the observer).

Emic vs etic is posit(ion) metric, rather than the "perspective" of the viewed inside and viewer outside respectively. The space-traveler whose former contemporaries had aged faster is the case in point. Or Plato's traveler who returns to the cave, brimming with novelty.

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