| 21. | He made major contributions to astrometry.
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| 22. | This is done using astrometry, which is the practice of measuring the position of stars.
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| 23. | The science of actually measuring positions of celestial objects in the sky is known as astrometry.
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| 24. | Research has focused on stellar characteristics, astrometry, and refining the limits of possible planets.
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| 25. | Initially the observatory was dedicated to astrometry, geodetic and meteorological observation and tracking the time.
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| 26. | It will also from 2011 be part of the International VLBI Service for Geodesy and Astrometry.
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| 27. | Those shifts are very large in comparison to the measurement precisions that are required for astrometry.
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| 28. | In some specialized cases, such as astrometry, FGSs can also be used as scientific instruments.
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| 29. | Primary work consists of planetary, deep sky, NEO studies, astrometry, photometry and astrophotography.
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| 30. | Based on parallax measurements from the Hipparcos astrometry satellite, this star is located about from the Earth.
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