We're nearing the peak of the 11-year solar cycle, so double-check your GPS and watch where you're going.

我们正在接近每11年太阳活动周期的顶峰，所以请重新检查你的GPS，注意你的去向。

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Three times in the past the regular 11-year solar cycle has gone on an extended vacation - at the same time as cool periods on Earth.

每11年为一个周期的太阳黑子活动曾有三次未如期而至，而这三次都导致地球气候的变冷。

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The calendars that were developed at the lower latitudes were influenced more by the lunar cycle than by the solar year.

在低纬度地区制定的历法受月球周期的影响比受太阳年的影响更大。

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The northern lights have been particularly spectacular in 2013 as the sun is expected to reach the peak of its 11-year solar cycle later this year.

CNN: Northern lights dazzle Northern Hemisphere

The sun is currently in an active phase of its 11-year solar cycle, and it should continue to fire off big storms for a while yet.

MSN: Amazing video captures magical-looking sun storm

The data, from NASA's TIMED mission, show that Earth's thermosphere (the layer above 62 miles or 100 km above the Earth's surface) "responds quite dramatically to the effects of the 11-year solar cycle, " Stan Solomon of the National Center for Atmospheric Research in Boulder, Colo.

MSN: Earth's upper atmosphere cooling dramatically