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==Astronomy== * [[Friedrich Wilhelm Bessel]] makes the first accurate measurement of distance to a star, [[61 Cygni]], using [[parallax]]. [[Thomas James Henderson|Thomas Henderson]] ([[Alpha Centauri]]) and [[Friedrich Georg Wilhelm Struve]] ([[Vega]]) announce their measurements using parallax shortly afterwards. * [[Claude Servais Mathias Pouillet]] makes the first quantitative measurements of the [[heat]] emitted by the [[Sun]]. * [[Peter Andreas Hansen]] publishes a revision of the [[lunar theory]], ''Fundamenta nova investigationis orbitae verae quam luna perlustrat''.
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