What's the difference between ophiuchus and serpentarius?

Ophiuchus

Definition:

• (n.) A constellation in the Northern Hemisphere, delineated as a man holding a serpent in his hands; -- called also Serpentarius.

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Serpentarius

Definition:

• (n.) A constellation on the equator, lying between Scorpio and Hercules; -- called also Ophiuchus.

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