任何人只要有这样一块十进制表，再加上能看到地平线以上太阳的高度，就会立刻知道他在地球上的位置。

Any observer with a decimal chronometer and a view of the sun's height above the horizon would then know instantly where on the planet he was.

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月亮必须在天空中很低的位置——与地平线只有42度。

The moon has to be very low in the sky—only 42 degrees from the horizon.

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人们认为这种表的优势在于：任何人只要有这样一块十进制表，再能看到地平线以上太阳的高度，就会立刻知道他在地球上的位置。

The supposed advantage was that any observer with a decimal chronometer and a view of the sun’s height above the horizon would then know instantly where on the planet he was.

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