Anders Celsius (1701-44) invented and gave his name to the Celsius thermometer, also known as the centigrade thermometer. The scale on the Celsius thermometer is a simplification of the earlier Fahrenheit scale, showing the freezing point of water at zero and the boiling-point at 100 degrees.
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Celsius was born at Uppsala, in Sweden and became a professor at Uppsala University. He was a leading astronomer of his time (he built the observatory at Uppsala) and one of the first to advocate the adoption of the Gregorian calendar in Sweden.
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