| 11. | Based upon an annual parallax shift of 7.53 milliarcseconds, the distance to this star is about.
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| 12. | By contrast, "'astrometric radial velocity "'is determined by secular change in the annual parallax ).
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| 13. | The parsec ( 3.26 light-years ) is defined as the distance for which the annual parallax is 1 arcsecond.
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| 14. | Annual parallax is normally measured by observing the position of a star at different times of the year as Earth moves through its orbit.
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| 15. | Based upon an annual parallax shift of 0.16625 arc seconds as measured by the Hipparcos satellite, this system is from Earth.
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| 16. | Based upon an annual parallax shift of 0.184 arc seconds as measured by the Hipparcos satellite, this system is from Earth.
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| 17. | Annual parallax is normally measured by observing the position of a star at different times of the year as the Earth moves through its orbit.
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| 18. | Based upon an annual parallax shift of 10.23 ( with a 3 % margin of error ), the distance to this star is.
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| 19. | Measurements made with the Hipparcos spacecraft show an annual parallax shift of 0.0643, corresponding to a physical distance of about from the Sun.
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| 20. | Measurements made with the Hipparcos spacecraft show an annual parallax shift of 0.031843, which is equivalent to a distance of around from the Sun.
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