Word origin · etymology
Modern mathematical and astrological compound.
Harmonic identifies the transformed circle; orb retains the surrounding-circle or allowable-range sense. The phrase specifies tolerance in that harmonic frame.
How we know · epistemology
Scaled angular tolerance
Multiplication by the harmonic number scales a nearby natal deviation, so transformed orb divided by that number gives the local natal equivalent. Comparisons require declaring which space supplies the tolerance; a larger search can otherwise create misleadingly numerous matches.
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