This is because it marks the time when the sun ultimately shines perpendicular to the Tropic of Cancer.

这是因为它标志着太阳最终垂直于北回归线照射的时间。

On November 26, at three o'clock in the morning, the Nautilus cleared the Tropic of Cancer at longitude 172 degrees.

11月26日早晨三点， 诺第留斯号在西经172度上越过了北回归线。

It seemed to be traveling at random, as if hesitating over which course to follow, but it never crossed the Tropic of Cancer.

船好像是随意地行驶，因为它沿着走的航线很不一定，不过它从不越过北回归线。

The captain said we'd be passing the Tropic of Cancer soon.

船长说我们马上就要穿过北回归线了。

The bad news is that to set a record you need to fly 22,750 miles—the length of the tropic of cancer.

坏消息是，要创下纪录， 您需要飞行 22, 750 英里——北回归线的长度。

These monitor the Atlantic a couple of degrees north of the Tropic of Cancer, the part of the world where the surveys reported in the Nature paper had been conducted.

这些卫星监测北回归线以北几度的大西洋，《自然》论文中报道的调查是在该地区进行的。