While Ptolemy noted that Ophiuchus is in contact with the ecliptic, he was aware that the 12 signs were just conventional names for 30-degree segments.
Sementara Ptolemy mencatat bahwa Ofiukus dalam kontak dengan ekliptika, ia menyadari bahwa 12 tanda-tanda yang konvensional hanya nama-nama untuk 30 derajat segmen.