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In January 1997, at the Observat orio Nacional (ON), Rio de Janeiro, Brazil, digital CCD observations of the solar diameter began with a Danjon astrolabe adapted for solar observations and equipped with a variable angle reflecting prism. The prism enables observations of the Sun several times per day and all year round at the south- ern latitude ' = 2254 0 .

Solar diameter observations at Observatório Nacional in 1998-1999