And these colorful dots mark the position of stars with known " exoplanets" .

这些彩色圆点标记了环绕着已知" 系外行星" 的恒星的位置。

An astrolabe is an instrument that was used for centuries to mark the positions of the sun and stars.

星盘是数百年来用来标记太阳和恒星位置的仪器。

You can see it here, as well as in the tape he used to mark the cameras’ positions.

你可以在这里看到它，也可以在他用来标记摄像机位置的胶带中看到它。