地轴指向北极星，在这一圈同心圆中心附近。

The Earth's axis points toward Polaris, the North Star, near the center of the concentric trails.

地轴是我们虚构的穿过地心的一个倾斜的直线轴。

The tilt of the earth's axis, that imaginary pole that runs through the center of the earth.

根据它（指地轴）倾斜角度的不同，季节的严酷程度也不同。

Depending on the angle it tilts at, the seasons can be more or less severe.

这些镜子可以在几千英里的高空以地球绕地轴旋转的速度运行。

The mirrors could orbit—thousands of miles high—at the same speed as the earth turns on its axis.

对天文学家而言，纯净的大气层和在地轴上的位置使其成为观测天象的完美地点；

For astronomers, its pristine atmosphere and location at the earth's axis makes this the perfect place to gaze into the heavens.