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  this is the time when Nicolaus Copernicus published the Heavenly Spheres.
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  On this date, Andreas published On The fabric of the human body and it was very important to him.
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  This is the time when Ptolemy spread his theory of the Geocentric model in space.
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  In this year, Galileo conducted an experiment and the Leaning Tower of Pisa
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  On this day in history, Francis Bacon published a book called The Advancement of Learning.
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  In this year, Johannes put his laws of Planetary motion out in the world.
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  On this day, Robert Hooke discovered cells, a very famous discovery.
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  On this day in history, Antonie Leeuwenhoek Discovered bacteria which is a very famous discovery.