虽然当时世界各地都有按照哈雷的建议进行金星凌日的观测，但由于凌始及凌终时，金星在太阳表面有黑滴现象（Black drop effect）一种当金星在凌始内切后和凌终内切前，金星与太阳边沿接近时因地球大气扰动和太阳临边昏暗产生的光学现象，引至金星变成拉长了的...
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金星凌日时常出现黑滴效应(black drop effect)，指当初切及终切时因金星的大气层影响，使观测者看到金星与太阳被一条黑影连接著。
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The Black Drop Effect 黑滴效应
以上来源于: WordNet
Cook speculated that this phenomenon, which became known as the black-drop effect, was caused by "an atmosphere or dusky cloud round the body of the planet."
这个现象后来被称为「黑滴效应」，库克猜测是由「金星周围的大气或尘埃云」造成的。
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There is also historical research to be done: for instance, what causes that meddlesome black-drop effect?
ECONOMIST: Transits of Venus
This was because they saw the black-drop effect in a transit of Mercury, a planet that has no atmosphere.
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