十万个为什么·科学启蒙30篇（3）
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The Moon Slides in Front of the Sun
月亮滑到太阳前面，就发生日食
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A solar eclipse happens when the Moon passes exactly between Earth and the Sun.
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Its shadow then falls on part of Earth’s surface for a few minutes.
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This only works because the Moon and Sun appear almost the same size in our sky.
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Even though the Sun is much bigger, it’s also much farther away from us.
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When the Moon covers the Sun completely, daylight turns into twilight suddenly.
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Birds may stop singing, and temperatures drop by several degrees quickly.
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You must never look directly at the Sun during an eclipse without special glasses.
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Partial eclipses show just a bite taken out of the Sun’s bright circle.
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People in different cities see different amounts of coverage depending on location.
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Next year, a total eclipse will cross parts of Mexico, the U.S., and Canada.