GI2T

GI2T, for Grand Interféromètre a 2 Télescopes, was a 1980s optical interferometer at CERGA Observatory, which was a Côte d'Azur Observatory station near Grasse, France. GI2T consisted of two 1.5-meter telescopes, and could extend its baseline up to 65 meters.

GI2T was a follow-on to I2T, an earlier CERGA Observatory optical interferometer in the 1970s consisting of two 26-cm telescopes with a 140-meter baseline. SOIRDETE (for Synthése d'Ouverture en Infra Rouge avec Deux Telescopes) was a late-1980s and 1990s infrared interferometer with two 1-meter telescopes and a fixed 15-meter baseline. More recently in 2015, the SOIRDETE facilities have been revived and renamed C2PU (for Centre Pédagogique Planète Univers) for more general research and educational use, one of its projects being I2C (for Intensity Interferometry at Calern), which uses it as an intensity interferometer.