Other early instruments included the sextant and the astrolabe.

另外的早期仪器还有六分仪和星盘.

Alt tag: Brass astrolabe engraved with calligraphic inscriptions (Courtesy of Metropolitan Museum of Art)

刻有书法装饰的黄铜星盘

On the astrolabe, an off - centered circle represents the orbit of the sun - the ecliptic.

在星盘上, 一个偏心的圆代表了太阳的运行轨道――黄道.

Some scholars believe that this astrolabe was created by the prince in collaboration with an unnamed metalworker.

一些学者认为，这个星盘是奥马尔王子与一位无名金属制造工匠共同制作的。

We can compare Bhu - mandala with an astronomical instrument called an astrolabe, popular in the Middle Ages.

我们可以用Bhu -mandala 与一种叫做星盘的天文仪器作一个比较,这种仪器在中世纪十分常用.