Historedia
Person

François Arago

Events
4
Episodes
11
Years
1819–1840

Every event in Historedia whose sources name François Arago, with the role they cite and all of that event’s episodes. This is not a biography, and mentions are grouped by name, so two people with the same name can share this page.

Events and episodes

  1. Discovery of the Great Comet of 1819

    1819

    Role: Analyst

    1. 1 July 1819 · BerlinDiscovery of the Great Comet of 1819

      Johann Georg Tralles discovered the Great Comet of 1819 in Berlin on 1 July 1819, observing a brilliant comet during evening twilight.

  2. Louis Daguerre develops the daguerreotype process

    1837–1839

    Role: Spoke at the 19 August 1839 joint meeting, referring to the daguerreotype

    1. April 1837 · Unspecified location of Daguerre's remark to Isidore NiépceEquipment Readiness

      In April 1837, Daguerre told Isidore Niépce his equipment for taking daguerreotypes was ready, needing only good weather.

    2. 19 August 1839 · French GovernmentPublic Announcement

      Daguerre announced the daguerreotype publicly in 1839 after failing to secure private investors.

  3. Daguerre's Moon photograph and the French Academy announcement of the daguerreotype

    1839

    Role: Reporter

    1. 7 January 1839 · French Academy of SciencesFrench Academy Announcement of 7 January 1839

      The French Academy of Sciences announced the daguerreotype at a joint meeting on 7 January 1839; the legacy 9 January date is unsupported.

    2. circa 14 August 1839 · British patent systemBritish Patent Filing

      Five days before the 19 August 1839 announcement, Miles Berry filed British patent No. 8194 of 1839 on Daguerre's behalf.

    3. 19 August 1839 · ParisGovernment Gift to the World

      The French government presented the daguerreotype as a gift "free to the world" on 19 August 1839.

  4. Adolphe Thiers becomes prime minister of France

    1840

    Role: Radical Deputy

    1. March 1840 · ParisSecret Funds Debate

      Thiers secured an easy majority in the debate on secret funds in March 1840.

    2. 1 March 1840 – October 1840 · ParisFormation of the Second Thiers Cabinet

      Thiers formed his government on 1 March 1840, following the collapse of the Soult cabinet on 20 February 1839.

    3. 12 May 1840 · ParisTransfer of Napoleon's Remains

      The government announced the transfer of Napoleon's remains to the Invalides.

    4. 16 May 1840 · ParisRejection of Social Reforms

      Thiers rejected universal suffrage and social reforms following a speech by François Arago.

    5. 7 October 1840 · France (negotiations between the king and Thiers; specific site not stated in sources)Diplomatic Compromise on Egypt

      A compromise was reached regarding French support for Muhammad Ali in Syria.

Sources

  1. Great Comet of 1819 Wikipedia, revision of 2026-07-14
  2. Daguerreotype Wikipedia, revision of 2026-10-01
  3. François Arago Wikipedia, revision of 2026-09-04
  4. July Monarchy Wikipedia, revision of 2026-08-27