The black drop effect hampered efforts to obtain a precise value of the astronomical unit during the 1769 transit of Venus observations.
Sources
- 1874 Transit of Venus Expedition to Hawaii (en.wikipedia.org)
- https://skyandtelescope.org/astronomy-news/history-and-sky-lore/the-transit-of-venus-tales-from-the-18th-and-19th-centuries/ (skyandtelescope.org)
- https://www.astronomy.ohio-state.edu/pogge.1/Ast161/Unit4/venussun.html (astronomy.ohio-state.edu)
- https://www.researchgate.net/publication/228709715_The_black-drop_effect_explained (researchgate.net)
- https://arxiv.org/pdf/astro-ph/0310379 (arxiv.org)
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