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1
Friedrich Wilhelm Bessel was a German astronomer who measured the first reliable stellar parallax, for 61 Cygni, in 1838.
2
James Bradley was an English astronomer who discovered stellar aberration in 1728, providing evidence for Earth's motion around the Sun.
3
Friedrich Georg Wilhelm von Struve was a Baltic German astronomer who studied double stars and founded Pulkovo Observatory in 1839.
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