Optics

• Glass lenses
  Lens (optics)
  A lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light, converging or diverging the beam. A simple lens consists of a single optical element...
  
   are developed in the Netherlands and used for the first time in microscope
  Microscope
  A microscope is an instrument used to see objects that are too small for the naked eye. The science of investigating small objects using such an instrument is called microscopy...
  
  s and telescope
  Telescope
  A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation . The first known practical telescopes were invented in the Netherlands at the beginning of the 1600s , using glass lenses...
  
  s.
• A compound microscope is developed by Zacharias Janssen
  Zacharias Janssen
  Zacharias Jansen was a Dutch spectacle-maker from Middelburg associated with the invention of the first optical telescope. Jansen is sometimes also credited for inventing the first truly compound microscope...
  
   and his father in Holland.

Births

• approx. date - Giovanni Battista Zupi
  Giovanni Battista Zupi
  Giovanni Battista Zupi or Zupus was an Italian astronomer, mathematician, and Jesuit priest.He was born in Catanzaro. In 1639, Giovanni was the first person to discover that the planet Mercury had orbital phases, just like the Moon and Venus. His observations demonstrated that the planet orbited...
  
  , Italian
  Italian people
  The Italian people are an ethnic group that share a common Italian culture, ancestry and speak the Italian language as a mother tongue. Within Italy, Italians are defined by citizenship, regardless of ancestry or country of residence , and are distinguished from people...
  
   astronomer
  Astronomer
  An astronomer is a scientist who studies celestial bodies such as planets, stars and galaxies.Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using...
  
   (d. 1650
  1650 in science
  The year 1650 in science and technology involved some significant events.-Astronomy:*In Ursa Major, the handle's middle star, Mizar, is noted to be a binary star by Giambattista Riccioli.-Botany:* Begonias are first discovered by Francisco Hernandez....
  
  )

Deaths

• December 20 - Ambroise Paré
  Ambroise Paré
  Ambroise Paré was a French surgeon. He was the great official royal surgeon for kings Henry II, Francis II, Charles IX and Henry III and is considered as one of the fathers of surgery and modern forensic pathology. He was a leader in surgical techniques and battlefield medicine, especially the...
  
  , French
  French people
  The French are a nation that share a common French culture and speak the French language as a mother tongue. Historically, the French population are descended from peoples of Celtic, Latin and Germanic origin, and are today a mixture of several ethnic groups...
  
   surgeon
  Surgeon
  In medicine, a surgeon is a specialist in surgery. Surgery is a broad category of invasive medical treatment that involves the cutting of a body, whether human or animal, for a specific reason such as the removal of diseased tissue or to repair a tear or breakage...
  
   (b. c.1510
  1510 in science
  The year 1510 in science and technology included many events, some of which are listed here.-Births:* October 6 - John Caius, English physician and benefactor .* Giovanni Filippo Ingrassia, Sicilian anatomist .* approx. date...
  
  ).