Mariners were also able to fix their latitude by using an instrument called astrolabe.海员们还可使用星盘这种仪器确定纬度。Mariners were also able to fix their latitude , by using an instrument called an astrolabe.海员们还可使用星盘这种仪器确定纬度.Other e...
Mariners were also able to fix their latitude by using an instrument called astrolabe.海员们还可使用星盘这种仪器确定纬度。prismatic astrolabe棱镜等高仪Other early instruments included the sextant and the astrolabe.另外的早期仪器还有六分仪和星盘.photoelectric...