Indeed it also seems it was even the only planetary model that was generally observationally tenable, given the twin failures to find any stellar annual parallax nor any Martian daily parallax at that time.
32.
The open stellar cluster Doppler redshift of the stellar spectral lines, allows estimation of the distance to the cluster ( 151 light-years ) and its member stars in much the same way as using annual parallax.
33.
In 1838, Friedrich Bessel made the first successful measurements of annual parallax for the star 61 Cygni, of 0.314 arcseconds; which indicated that the star was 10.3 ly away, close to the currently accepted value of 11.4 ly.
34.
Stellar parallax is most often measured using " annual parallax ", defined as the difference in position of a star as seen from Earth and Sun, i . e . the angle subtended at a star by the mean radius of Earth's orbit around the Sun.
35.
Stellar parallax is most often measured using "'annual parallax "', defined as the difference in position of a star as seen from the Earth and Sun, i . e . the angle subtended at a star by the mean radius of the Earth's orbit around the Sun.
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