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Theodore Sider (2001) claimed that the theory could not handle maximal properties: properties of objects that are not shared by their large proper parts.
By combining a novel genetic algorithm with density functional theory (DFT), we predict that the true ground states in 1 1 and 2 2 BaTiO3/CaTiO3 superlattices grown on SrTiO3 adopt Pc symmetry with a large proper electric polarization (32.8 μC/cm2 for 1 1 and 35.8 μC/cm2 for 2 2 superlattices), which is even larger than that of bulk BaTiO3.
61 Cygni first attracted the attention of astronomers because of its large proper motion.
The large proper motion of 61 Cygni was first demonstrated by Giuseppe Piazzi in 1804, who christened it the "Flying Star".
Based on observations between 1800 and 1880, Epsilon Eridani was found to have a large proper motion across the celestial sphere, which was estimated at an angular velocity of three arcseconds annually.
The system's large proper motion, the largest known for any star at the time, made 61 Cygni a candidate for the determination of its distance by the method of parallax when the quality of astronomical observations first made this possible.
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Barnard's star has the largest proper motion of any known star 10.25 seconds of arc annually.
This constellation contains Barnard's Star, the second nearest star to Earth at a distance of six light-years and the star with the largest proper motion.
Only a few years later, however, Groombridge 1830 was discovered to have a larger proper motion.
It has the largest proper motion of any star in the sky after Barnard's Star.
61 Cygni retains the distinction of having the largest proper motion of any star visible to the unaided eye (although Groombridge 1830 at magnitude 6.4 can be seen with the naked eye under exceptionally dark skies).
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