This paper describes in detail how to adjust spectrometer so as to keep a strict vertical between optic axis and rotation axis of telescope.

本文详细描述如何调节分光计以使望远镜光轴与其旋转轴严格垂直。

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In the perpendicular direction to the rotation axis of the petal, the repeat position error is most sensitive to the position error of the locking force.

在对接面内与旁瓣转轴方向相垂直的方向上，重复定位误差对锁紧力位置误差最为敏感。

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Precession, basically is the change in the direction of earth's axis of rotation.

岁差，基本上是地球自转轴方向的改变。

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Because Jupiter's axis of rotation does not quite line up with its magnetic axis, the moons that orbit the planet feel such a fluctuating magnetic force.

ECONOMIST: Blue moon

Today motion sensing has progressed to being three-axes of acceleration, and three axis of rotation (technically called gyroscopes).

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Christoph Scheiner was one of the discoverers of sunspots and discovered the rotation of the sun on its axis.

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