Fraunhofer heliometer at Königsberg Observatory

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The Fraunhofer heliometer at Königsberg Observatory was a pioneering 19th-century astronomical instrument designed by Joseph von Fraunhofer, renowned for enabling the first successful measurement of stellar parallax and thus the first reliable distance determination to a star.

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stellar parallax of 61 Cygni observedWith Fraunhofer heliometer at Königsberg Observatory