Scientists attempted to measure the astronomical unit by observing the transit of Venus in 1769.
Sources
- 1874 Transit of Venus Expedition to Hawaii (en.wikipedia.org)
- https://www.loc.gov/collections/transit-of-venus-march/articles-and-essays/what-is-the-transit-of-venus/ (loc.gov)
- https://www.astronomy.ohio-state.edu/pogge.1/Ast161/Unit4/venussun.html (astronomy.ohio-state.edu)
- https://libguides.usna.edu/sca/10536/transit-of-venus-1769 (libguides.usna.edu)
- https://arxiv.org/pdf/1301.0296 (arxiv.org)
- https://arxiv.org/pdf/astro-ph/0310379 (arxiv.org)
- https://skyandtelescope.org/astronomy-news/transits-of-venus-in-history-1769-today/ (skyandtelescope.org)
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