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An illustration of how position angle is estimated through a telescope eyepiece; the primary star is at center. In astronomy, position angle (usually abbreviated PA) is the convention for measuring angles on the sky.
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The relative proximity of the two stars combined with the 6.5 billion kilometer (about 43 AU) distance of the spacecraft from Earth yielded a discernible parallax of arcminutes, allowing the parallax to be seen visually without instrumentation. [15] Parallax of Proxima Centauri as observed from New Horizons and Earth. [16]
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The two stars are of nearly equal brightness, with visual magnitudes of 12.7 and 13.2 as seen from Earth. They orbit one another every 26.5 years. The distance between the two stars varies from 2.1 to 8.8 astronomical units (310 to 1,320 Gm ).
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The difference between this measurement and the nadir point was the nadir distance of the star. A movable horizontal wire or declination-micrometer was also used. [11] Another method of observing the apparent altitude of a star was to take half of the angular distance between the star observed directly and its reflection observed in a basin of ...
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