The direct access to the interior of the Sun has been possible, over the past 25 years, by successfully applying seismic techniques to detect and to characterize the whole spectrum of its oscillation eigenmodes. The unique and huge amount of observational data provided by earth-based networks and space-borne instruments, has allowed a high degree

The GTC (Gran Telescopio Canarias) employs an Acquisition and Slow Guiding Sensor based on a Marconi CCD47-20. This chip is also the core sensor for the telescope Segment Figure Sensor. A third sensor, based on a Marconi CCD39-01 implements Fast Guiding and is also used for Wavefront Sensing under continuous rotation. 1 Hz full-frame readouts and

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