section_path: History/In science
section_name: In science
paragraph_text: In science
  
  Drawing diagrams of observations is an important part of scientific study.
  
  In 1609, astronomer Galileo Galilei explained the changing phases of Venus and also the sunspots through his observational telescopic drawings. In 1924, geophysicist Alfred Wegener used illustrations to visually demonstrate the origin of the continents.