| 41. | The degradation is more severe for the RVS spectrograph than for the astrometry measurements, and only affects the fainter stars.
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| 42. | Harris was responsible for the August 1973 IAU Symposium No . 61 in Perth on " New Problems of Astrometry ".
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| 43. | Astrometry is understood by precisely measuring delay line additions while fringing, to match the light path differences from baseline ends.
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| 44. | The system's distance from the Sun as measured by the Hipparcos astrometry satellite is approximately 120 light-years.
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| 45. | The whole system lies about 83 light-years away from the Sun, as measured by the Hipparcos astrometry satellite.
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| 46. | The publication of the shape model and of astrometry based on radar observations obtained in 1999, 2005, and 2011,
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| 47. | Debehogne worked at the Royal Observatory of Belgium ( ) in Uccle, and specialized in astrometry of comets and minor planets.
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| 48. | Most of early astronomy actually consisted of mapping the positions of the stars and planets, a science now referred to as astrometry.
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| 49. | NOFS is heavily involved with the science of star catalogs and astrometry, or the positions and distances of stars and celestial objects.
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| 50. | It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky.
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