During the late 19th century, individuals and organizations planned for years in advance to observe a total solar eclipse. These high-stakes astronomical expeditions involved many scientific practitioners whose collective eclipse experience helped to grow and sustain 19th-century mathematical communities.  Especially in the United States, connections forged beneath the sun’s shadow sustained networks of communication, facilitated periodical publication, and set precedent for government funding in support of mathematical activity in the 19th- century United States.This lecture was recorded by Professor Deborah Kent  on 18 October 2023 at Barnard's Inn Hall, LondonThe transcript and downloadable versions of the lecture are available from the Gresham College website:https://www.gresham.ac.uk/watch-now/Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: https://gresham.ac.uk/support/Website:  https://gresham.ac.ukTwitter:  https://twitter.com/greshamcollegeFacebook: https://facebook.com/greshamcollegeInstagram: https://instagram.com/greshamcollegeSupport the show

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