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  1. Há 21 horas · Carl Friedrich Gauss 1803 by Johann Christian August Schwartz On 1 January 1801, Italian astronomer Giuseppe Piazzi discovered the dwarf planet Ceres . [157] Piazzi could track Ceres for only somewhat more than a month, following it for three degrees across the night sky, less than 1% of the total orbit, until it disappeared temporarily behind the glare of the Sun.