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...a disk. The distance to a [[star]] was first measured in 1838, when the [[parallax]] of [[61 Cygni]] was measured by [[Friedrich Bessel]]. The measurement of [[parallax|stellar parallax]] of nearby stars provides a fundamental baseline in the [[cosmic distance

...went to the [[Cape of Good Hope]] for the purpose of determining the sun's parallax by observations of the parallaxes of [[Mars]] and [[Venus]], and incidental

...that the Earth orbited the Sun, apparently because there was no detectable parallax, which was not, in fact, proved until 1838 by Bessel.<ref>[http://www.astro

...celestial observations, and many well-established phenomena (no fixed star parallax, invariance of laws of motion) could at first not be explained in the helio