The GTC is a high performance 10-m class telescope to be installed at the Roque de los Muchachos Observatory (ORM), on the island of La Palma. First light is planned for end 2002 and the start of full scientific operations for end 2003. The GTC top level science requirements are to achieve: (1) a major improvement in limiting magnitude between 0.3

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We investigate the use of surface brightness fluctuations (SBF) measurements in optical and near-IR bandpasses for both stellar population and distance studies. New V-band SBF data are reported for five galaxies in the Fornax cluster and combined with literature data to define a V-band SBF distance indicator, calibrated against Cepheid distances to

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The LOI (Luminosity Oscillations Imager) is a low resolution solar photometer built at the SSD of ESA. It is one of the instruments in the VIRGO experiment on board the SOHO satellite. In May 1994, the Qualification Model of the LOI was installed at the Observatorio del Teide (Tenerife) and since then it has been working continuously (LOI-T). The

High quality observations of the low degree p-modes exist for almost two complete solar cycles using the solar spectrophotometer Mark-I, located and operating at the Observatorio del Teide (Tenerife, Spain). In this work, the observations available have been re-analyzed over a much wider time interval than before. We analyze the time variation of