The 1874 transit of Venus expeditions were designed to obtain an accurate estimate of the astronomical unit (AU), the distance from Earth to the Sun, by measuring solar parallax.
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- 1874 Transit of Venus Expedition to Hawaii (en.wikipedia.org)
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- https://www.tandfonline.com/doi/full/10.1080/03036758.2012.676053 (tandfonline.com)
- https://link.springer.com/chapter/10.1007/978-3-319-22566-1_15 (link.springer.com)
- https://cudl.lib.cam.ac.uk/collections/tov/1 (cudl.lib.cam.ac.uk)
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- https://www.researchgate.net/publication/300133043_Refining_the_Astronomical_Unit_Queenstown_and_the_1874_Transit_of_Venus (researchgate.net)
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