description Serpentarius Overview
Serpentarius is a historical Latin name for Ophiuchus, the constellation represented as a person holding a serpent. It refers to the serpent-bearer, not to the snake itself, which belongs to the neighboring constellation Serpens. Ophiuchus appears in Ptolemy's classical constellation catalog and remains recognized in modern astronomy under its Greek-derived name. The figure helps explain the unusual arrangement of Serpens, whose two separated portions lie on either side of Ophiuchus.
This is a relationship between neighboring constellation figures, rather than evidence that Serpentarius was a separate, lost constellation. The historical name is useful when reading older star maps or comparing Latin and Greek astronomical terminology. For historians of astronomy, it illustrates how a familiar region of the sky can retain its identity while the preferred wording changes. Its defining interest lies in naming history rather than a different set of stars.
help Serpentarius FAQ
Is Serpentarius the same constellation as Ophiuchus?
Yes, Serpentarius is the historical Latin name for the constellation now more commonly called Ophiuchus, meaning 'serpent-bearer.' Both names refer to the same figure from Ptolemy's original star catalogue who holds the serpent constellation Serpens.
Why isn't Ophiuchus part of the twelve zodiac signs?
Although Ophiuchus lies along the ecliptic path that the Sun appears to travel through, the traditional twelve zodiac signs were established by Babylonian astronomy, which divided the ecliptic into twelve equal segments. Ophiuchus falls between Scorpius and Sagittarius on this path.
What constellation does Ophiuchus divide?
Ophiuchus is uniquely positioned so that it splits the constellation Serpens (the Serpent) into two separate parts: Serpens Caput (the serpent's head) and Serpens Cauda (the serpent's tail). This makes Ophiuchus and Serpens the only constellations that interlock in this way.
Where can I find Ophiuchus in the night sky?
Ophiuchus is best viewed during summer months in the Northern Hemisphere, located between the constellations Scorpius and Sagittarius near the celestial equator. It is a large but relatively faint constellation, so dark skies are helpful for spotting it.
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