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The Barometer. Evangelista Torricelli became the first scientist to create a sustained vacuum and to discover the principle of a barometer. Torricelli realized that the variation of the height of the mercury from day to day was caused by changes in the atmospheric pressure.
The other theory was the heliocentric or Copernican theory which held that the sun was the center of the universe and that day and night were due to the rotation of the earth. This theory was named after a Catholic canon, Nicolaus Copernicus, who published a book on it 21 years before Galileo was born.he other theory was the heliocentric or Copernican theory which held that the sun was the center of the universe and that day and night were due to the rotation of the earth. This theory was named after a Catholic canon, Nicolaus Copernicus, who published a book on it 21 years before Galileo was born.