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140 A.D. Claudius Ptolemy Geocentric Theory
Ptolemy created the Geocentric Theory in 140 A.D. This theory states that the Earth is the center of the Universe and that all the other planets and stars revolve around the Earth. This theory was the first to give a mathematical an astronomical explanation of why the Earth was the center. Even if the theory was incorrect he was the first to take a step further to know how the planets move. -
1514 Nicolaus Copernicus Heliocentric Theory
Nicolaus Copernicus published a model of the Heliocentric Theory in 1514. This theory stated that the sun was the center instead of the Earth as Ptolemy said. By the sun being the center of the universe then the Planets revolve around the sun while the sun stays in the same position. This wasn't an original idea from Copernicus, he evolved the model and the idea from the Heliocentric Theory of Aristarchus who was an Ancient Greek. As the technology advanced they gathered information to prove it. -
1588 Tycho Brahe Celestial Maps
In 1588 Tycho Brahe created the Celestial Maps. The maps were created from observatory inthe Island of Hveen. This island was given to Brahe by King Frederik II. in the observatory he had the best instruments and tools of the time so he could create this maps with precision. Brahe had a team of assistants that helped him to analyze and create observations for the star charts and the maps. This maps were an advance in astronomy because now they could locate the planets and the stars. -
1609 Galileo Galilei The Telescope
Galileo Galilei created his first telescope in 1609. This telescope was based on other model of older telescope that had already been built. His telescope magnified the objects in space up to 3 times. Later on he began to modify his telescope and in the same year he created another telescope. This new telescope could magnify the objects up to 20 times their size. With this modified telescope he was able to make lots of observations like the sunspots, Jupiter's moons, the supernova and more. -
1609 Johannes Kepler 3 Laws About The Movement of The Planets
Johannes Kepler created 3 laws about the movement of the Planets in 1609. He created his first laws based on the notes of Brahe and his observations. The first law says that the planets move in elliptical paths and also that the sun is not exactly in the center of the universe, instead it is on the side. His second law is about an invisible line used to find the velocity of the planets, it also connects the sun to all the planets. The third law is about how long a planet takes to orbit the sun. -
1668 Isaac Newton Added Reflection to The Telescope
In 1668 Isaac Newton added reflection to the telescope. Newton created a theory of color which stated that by adding a mirror in a certain angle, the existent light will create another colored light by using reflection. He used this theory to be able to create the reflection used in telescopes. To prove his theory he created the first reflecting telescope by adding a mirror to act as the reflector. The name of this telescope is the Newtonian telescope.
