This is because only in that day, the moon will appear in the sun and the connection between the Earth, so will it be possible to block the sun and the moon formed the solar eclipse.

这是因为只有在那一天，月亮才会出现在太阳与地球之间的连线上，这样才有可能使月球挡住太阳而形成日食。

youdao

The moon raised, in mine eyes it was not the block stone. Even if lives not easily, it can remind we every day latent beauty.

月亮升起来了，在我的眼中它不是块石头。即使生活不容易，它都会提醒我们每天潜在的美丽。

youdao

Zhu Zhongqiu happy, moon cake I remember that I left the block Oh!

祝中秋快乐，记得留块月饼给我哦！

youdao

This eponymous theory is that large masses (such as the moon) partially block the gravitational force from more distant objects (such as the sun).

ECONOMIST: Gravitational anomalies

If the ratio of magnesium and iron on the moon conforms with scientists' predictions it will provide evidence that the moon really is a chip off the old block.

ECONOMIST: Astronomy

"For the May eclipse, the moon will be at the furthest distance from Earth that it ever achieves -- meaning that it will block the smallest possible portion of the sun, and leave the largest possible bright ring around the outside, " the agency said on its website.

CNN: Upcoming solar eclipse to project 'ring of fire'