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276 BCE
Eratosthenes
Eratosthenes was born 276 BC and died on 194 BC. Eratosthenes measured the Earth around 240 BC to estimate the circumference of the Earth so people would think that the Earth is not flat. -
100
Ptolemy
Ptolemy was a mathematician, astronomer, geographer and astrologer. He was born around 100 AD and died in Alexandria, Egypt. He believed that the Earth was center of the universe. He called this idea as the Geocentric theory. -
Feb 19, 1473
Nicolaus Copernicus
Nicolaus was a Polish astronomer who propose a heliocentric system. Nicolaus was born February 19, 1473 and died on May 24, 1543. Nicolaus published his heliocentric model in 1543. -
Dec 14, 1546
Tycho Brahe
Tycho developed and worked on astronomical instruments in August 21, 1560. Tycho was born on December 14, 1546 and died on October 24, 1601.Tycho Brahe was important because he made precise instruments available before the invention of the telescope. -
Dec 27, 1571
Johannes Kepler
Johannes Kepler was a German astronomer, mathematician, and astrologer. He figured out the law of planetary motion in 1609 to show everyone that all planets move around the sun. He was born on December 27, 1571 and died on November 15, 1630. -
Isaac Newton
Isaac Newton is a english mathematician, physicist, astronomer, theologian, and author. Isaac worked on discovering the gravity in 1687. He wanted to show people that some forces must be acting on falling objects like the apple. He was born on January 4, 1643 and died on March 31, 1727. -
Albert Einstein
Albert was a famous physicist. He was born on March 14, 1879 and died on April 18, 1955. Albert invented solar power in March 1958 he invented this because it made satellites work with the solar power.