horizontwis meridian excellent circle程度子午仪
horizontal l meridian circle水平子午仪
portable meridian circle轻便子午环
horizontal meridian circle水平子午仪
the meridian circle子午环
automatic meridian circle自动子午仪
lower latitude meridian circle低纬子午环
low latitude meridian circle低纬子午环
observer's meridian circle[天] 观测者子午圈
N（名词） an instrument used in astronomy for determining the declination and right ascension of stars. It consists of a telescope attached to a graduated circle 子午圈