During this period, the shadow of the Earth will slowly drift across the moon.

在这个过程中，地球的影子会缓慢飘过月亮。

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Sometimes the moon doesn’t completely fall into the shadow of the Earth, however.

有时候，月亮并没有完全进入地球的影子，这时候，只有一部分月亮变暗，我们将看到偏食。

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However, as the entire moon will cross the penumbra partial shadow of the earth, it will appear significantly dimmer around the time of partial eclipse.

但由于整个月球会经过地球的半影，在接近月偏食时，月球会明显较暗。

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Dr Duif rules out a third explanation, too: that cooling of the Earth's crust due to the eclipse shadow causes the ground to tilt slightly, and thus distorts the results.

ECONOMIST: Gravitational anomalies