noun
Octans; the Octant
A faint southern constellation introduced in the 18th century; its name refers to the octant, a navigational instrument.
はちぶんぎ座は南半球でしか見られない星座です。
Octans is a constellation that can only be seen in the Southern Hemisphere.
From 八分儀 (はちぶんぎ, 'octant', a navigational instrument) + 座 (ざ, 'constellation').