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Geocentric theory
Claudius Ptolemy, who was a Greco-Roman mathematician, astronomer, geographer, astrologer discovered a theory for geocentrism. -
1543
Discovery of Heliocentrism
Nicolaus Copernicus who is mathematician and astronomer formulated a model and published a book of Heliocentrism -
Observation of planet/satellite
Galileo Galilei observed/confirmed the phases of Venus, four largest satellites of Jupiter, Saturn and the analysis of sunspots using the telescope. -
Laws of planetary motion
Johannes Kepler, who was a German mathematician, astronomer, and astrologer discovered Laws of planetary motion -
Halley's comet
Edmond Halley, who was an english astronomer and mathematician that calculate the orbit of a comet later named after him. -
Discovery of Uranus
William Herschel who was a German-British astronomer, composer discovered a planet Uranus during the research of Double star -
Discovery of Neptune
Neptune was found by Urbain Le Verrier, the French mathematician who studied about the planets Mercury and Uranus using his own calculation -
Discovery of Pluto
Clyde William Tombaugh was an American astronomer. He discovered Pluto in 1930, the first object to be discovered in what would later be identified as the Kuiper belt. -
Voyagers 1 and 2
These satellites were launched out to study other planets.