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1543
Nicolaus Copernicus
Publishes his heliocentric worldview in his book "On the Revolutions of the Heavenly Spheres" -
1543
Nicolaus Copernicus
Proposed that the Earth orbits the sun annually and also turns once daily on its axis -
Nov 11, 1572
Tycho Brahe
Is the first to observe the new star or supernova in the Cassiopeia constellation -
Tycho Brahe
Publishes his Tychonic model of the comsos in his book Of More Recent Phenomena of the Ethereal World. -
Galileo Galilei
Invents the refracting telescopes, which was a powerful, new telescope at the time that bent light for a better view of the sky. -
Johannes Kepler
Discovers that Mars has an eliptical orbit around the Sun. -
Galileo Galilei
Is the first to observe the four moons of Jupiter. -
Johannes Kepler
Publishes his Rudolphine Tables, which was a mathematical calculation of the positions of the then known planets of the Solar System. -
Johannes Hevelius builds his Stellaeburg observatory in Danzig, Poland. It is a large rooftop observatory with an enormous telescope of 130ft (40m) focal length to observe the Moon, from which he drew extensive maps.
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Johannes Hevelius builds his Stellaeburg observatory in Danzig, Poland. It is a large rooftop observatory with an enormous telescope of 130ft (40m) focal length to observe the Moon, from which he drew extensive maps.
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Johannes Hevelius
Johannes Hevelius builds his Stellaeburg observatory in Danzig, Poland. It is a large rooftop
observatory with an enormous
telescope of 130ft (40m) focal length to
observe the Moon, from which he drew
extensive maps. -
Isaac Newton
Invented the reflecting telescope, which used mirrors to reflect light, creating an image. They are best used for distant stars and galaxies, which the refracting telescope could not see very well. -
Isaac Newton invented the reflecting telescope, which solved the problem of glare and color distortion, as well as allowed for a smaller, more practical telescope.
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Period: to
Giovanni Cassini
Discovered four of Saturn's moons: Iapetus, Rhea, Tethys, and Dione. -
Giovanni Cassini discovered the Cassini Division, the gap in Saturn's rings.
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Giovanni Cassini
Discovered the Cassini Division, the gap in Saturn's rings. -
Period: to
Giovanni Cassini discovered 4 of Saturns' moons.
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Isaac Newton published his book, "Principia," which talked about his theory of universal gravitation
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Isaac Newton
Published his discovery of and findings on universal gravitation in his book, "Principia Mathematica." -
Johannes Hevelius' Prodromus Astronomiae, which contains his star map of 1,564 stars, is published posthumously.
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Johannes Hevelius
Johannes Hevelius' "Prodromus Astronomiae," which contains his star map of 1,564 stars, is published posthumously. -
Huggins’s first spectroscopic observations are published, showing that stars are composed of the same elements that occur on the Sun and Earth.
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William Huggins
Huggins’s first spectroscopic observations are published, showing that stars are composed of the same elements that occur on the Sun and Earth. -
William Huggins
Became the first to measure the radial velocity of a star by the Doppler shift of its spectral (infrared) lines. -
Period: to
Albert Einstein
Einstein came up with the theories of
special and general relativity, which
is a more in-depth explanation of
gravity than what Newton
discovered. -
Albert Einstein
Predicted the existence of black holes. -
Edwin Hubble
Hubble used the Hooker telescope to prove that there are galaxies beyond the Milky Way. -
Edwin Hubble
Developed Hubble's law, which was the theory that the universe is expanding.