That's how long it takes the umbra to move over one spot on the Earth.

这就是本影扫过地球上某一点所需要的时间。

Finally, the Moon starts to enter the Earth's umbra, and the real eclipse begins.

最后，月亮开始进入地球的本影，真正的月食就开始了。

A partial eclipse is when the moon only gets covered by part of the Earth's umbra.

月偏食是指月球只被部分地球本影遮住的情况。

Here's the penumbra, a partially shaded outer region surrounding the umbra, a fully shaded inner part that's darkened.

这是半影区，一个包围了本影区的外部区域，本影区是一个完全黑暗的内部区域。

Instead, its umbra moves across the Earth.

相反，它的本影在地球上移动。

People in the path of the umbra may see a total solar eclipse.

在本影路径上的人们可能会看到日全食。

When the umbra touches the Earth, we get a total solar eclipse.

当本影接触地球时，我们会看到日全食。

Then, finally, the Moon's black disk completely covers the Sun — the umbra sweeps over your location.

最后，当本影扫过你所在的位置时，黑暗的月球完全遮住了太阳。

The narrow shadow in the middle, where Earth is totally blocks the sun’s light, is called the umbra.

中间较狭窄的阴影内，地球完全遮挡住了太阳光，这一部分阴影成为本影。

As the Moon passes into the central part of the Earth's shadow, called the umbra, it darkens dramatically.

当月球进入地球阴影的中心部分，即本影时，它会急剧变暗。

The earth's darker inner shadow is known as the umbra, and the lighter outer one is called the penumbra.

地球内部较暗的阴影被称为本影，较浅的外部阴影被称为半影。

The umbra is gone, but you're still in the penumbral shadow.

本影已经移开，但你仍处在半影中。

You're getting less light, and so you're technically shadowed, but it's not quite as dark as the umbra.

照在你身上的阳光减少，所以严格上说来你处于阴影中，但并不像本影那么黑。

Once it's entirely within the umbra, the Moon appears a dim red due to sunlight scattered through the Earth's atmosphere.

一旦它完全进入本影，由于阳光通过地球大气层散射，月球呈现出暗淡的红色。

That shadow is called the umbra and millions of Americans will be in it next Monday.

那个阴影被称为本影，下周一将有数百万美国人身处其中。

The moon's shadow, or umbra, is cast on the Earth, and anyone in the area of the shadow sees an eclipse.

月球的阴影，或称本影，投射在地球上，任何在阴影范围内的人都能看到日食。

The umbra is the dark part of Earth's shadow in a lunar eclipse and the moon shadow in a solar eclipse.

本影是月食时地球阴影和日食时月球阴影的黑暗部分。

As the moon shifts deeper into the umbra, it takes on a red hue which is sometimes called a blood moon.

随着月亮被本影遮蔽得更深，月亮会呈现出红色，有时这种月亮被称为血月。

There are a number of changes that happened in the places that are directly in the moon's umbra or shadow.

在直接位于月球本影或阴影中的地方发生了许多变化。

There are no annular lunar eclipses, because the Earth is so big that its umbra always appears larger than the moon.

没有月环食，因为地球太大了，它的本影总是显得比月球大。