| Read Eco's novel, which is full of Paris meridians, lunar parallaxes, the moons of Jupiter, and the Powder of Sympathy. |
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| It was designed to produce extremely accurate astrometric measurements in small fields, and has been used to measure parallaxes and therefore distance for faint stars. |
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| Together with nearby parallax stars, moving-group parallaxes provide the basis for the galactic distance scale. |
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| He also gives the tables of the longitudinal and latitudinal parallaxes for certain geographical latitudes, tables of eclipses, and tables of the visibility of the moon. |
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| By contrast, some of the well-known bright stars outlining the constellations have parallaxes as small as the limiting value of 0.001″ and are therefore well beyond several hundred light-years distance from the Sun. |
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| To determine the parallaxes, he perfected the use of the heliometer, a telescope that uses a split image to measure the angular separation of celestial bodies. |
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| It would be capable of measuring parallaxes of objects at kiloparsec distances with 10 percent accuracy. |
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| The combination of parallaxes and proper motions will provide transverse velocities with an accuracy better than 1 km s?1 for the majority of stars within 1 kpc. |
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