它是建立在三角视差的基础上的。

It is called the "Pillars Of Creation".

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哈雷意识到水星离地球如此之远，以至于很难确定它的视差角。

Halley realised that Mercury was so far away that its parallax angle would be very difficult to determine.

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由于金星离地球更近，所以它的视差角会更大。哈雷计算出，利用金星可以测量出太阳与地球之间的距离，误差为五百分之一。

As Venus was closer to the Earth, its parallax angle would be larger, and Halley worked out that by using Venus it would be possible to measure the Suns distance to 1 part in 500.

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