As often seen through an astronomical telescope eyepiece, the planet's orientation is inverted, with Mars' north polar cap at the bottom.

由于往往是通过天文望远镜的目镜拍摄，火星的方向是颠倒的，行星的北极冠在下面。

youdao

An optical telescope with a micrometer is used to precisely adjust the polar axis of an equatorial radio telescope and any precise dial and clock will not be needed.

使用一具附有测微器的光学望远镜配合赤道式射电望远镜进行极轴精密调整，不需用精确的度盘和记时设备。

youdao

Unfasten the R. A. clamp and turn the telescope around the polar axis to set the observing date on the date graduation ring to the observing time on the R. A. and hour graduation ring.

松开赤经制动钮并使望远镜围绕极轴旋转用以设置日期刻度盘上的观测日期对准赤经兼小时刻度盘上的观测时点。

youdao

Unfasten the R. A. clamp and turn the telescope around the polar axis to set the observing date on the date graduation ring to the observing time on the R. A. and hour graduation ring.

松开赤经制动钮并使望远镜围绕极轴旋转用以设置日期刻度盘上的观测日期对准赤经兼小时刻度盘上的观测时点。

youdao