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| - Global Sphere Reconstruction in the Astrometric Verification Unit
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| - The Gaia space satellite will perform absolute astrometry, aiming at the definition of a global astrometric reference frame at visual wavelengths. Within this reference system, it will be very difficult to identify possible errors in the measurements or in the data reduction process that brings about the definition of the final catalogue. The Gaia Data Processing and Analysis Consortium (DPAC) has established an Astrometric Verification Unit (AVU) to verify crucial steps in the baseline data processing chain and report on any significant difference. This process is essential in order to guarantee a high quality catalogue to the larger scientific community. We describe here the global sphere reconstruction (GSR) component of AVU hosted by the Italian data processing centre at Torino (DPCT).
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