Johannes Kepler and Modern Astronomy
Johannes Kepler and Modern Astronomy
Johannes Kepler and Modern Astronomy - Johannes Kepler (27 December 1571 – 15 November 1630), an important figure in the scientific revolution, was a German astronomer, mathematician and astrologer. He is best known for his laws of planetary motion. He is sometimes referred to as "the first theoretical astrophysicist", although Carl Sagan also calls him the last scientific astrologer.
At the age of 29, Johannes Kepler became the imperial mathematician for the Holy Roman Emperor, along with the royal astrologer General Wallenstein, a position he held until the end of his life. Kepler is also a professor of mathematics at the University of Graz. Kepler's career also coincided with that of Galileo Galilei. Early in his career, Kepler was an assistant to Tycho Brahe.
Kepler is highly regarded not only in mathematics. He became very famous in the fields of optics and astronomy. Kepler, despite his small stature, possessed a stunning intelligence as well as a persistent personality. He was discriminated against when he refused to convert to Roman Catholicism, even under intense pressure.
Johannes Kepler Background
Johannes Kepler was born in 1571 in Weil der Stadt, a small town on the outskirts of the German Black Forest. Despite his poor family, scholarships from local nobles allowed Johannes to get a good education. He studied theology at the University of Tüũbingen, in accordance with his intention to become a Lutheran minister. However, his genius in mathematics was recognized. In 1594, when a mathematics teacher at the Lutheran High School in Graz, Austria, died, Kepler took his place. While there, he published his first major work, Cosmographic Mystery.
Astronomer Brahe has spent years recording his observations of the planet in a meticulous and meticulous manner. When he read the Cosmographic Mystery, Brahe was impressed by Kepler's understanding of mathematics and astronomy, and he invited Kepler to join him at Benátky, near Prague, now in the Czech Republic. Kepler accepted the invitation when religious intolerance forced him to leave Graz. As noted above, when Brahe died, Kepler took his place. Instead of a meticulous observer, now the imperial advisory council had a genius in mathematics.
The Milestones of Optics
To fully benefit from Brahe's collection of planetary observations, Kepler needed to understand more about the refraction of light. How is reflected light from a planet refracted as it enters Earth's atmosphere? Kepler's explanation is contained in the book Supplement to Witelo, Expounding the Optical Part of Astronomy, which provides more detail on the work of Witelo, the Medieval Scientist. Kepler's book was a milestone in the field of optics. He was the first to explain how the eye works.
However, Kepler's main field was not optics, but astronomy. Early astronomers believed that the sky was an empty sphere with stars stuck inside like sparkling diamonds. Ptolemy regarded the earth as the center of the universe, while Copernicus believed that the planets all revolved around a stationary sun. Brahe estimated that the other planets revolved around the sun, which in turn orbited the earth. Because unlike Earth, all other planets are celestial bodies, these objects are considered perfect. The only form of motion that is considered suitable for the planets is a perfect circle shape, each planet moving at a constant speed. It was in this climate that Kepler began his stint as an imperial mathematician.
Modern Astronomy
Armed with tables of observations of planetary motions compiled by Brahe, Kepler studied cosmic motion and drew conclusions based on what he saw. Apart from being a numerical genius, he also has a strong determination and an inexhaustible curiosity. His extraordinary ability to work is evidenced by the 7,200 complex calculations he completed while studying observational tables about Mars.
And it was Mars who first caught Kepler's attention. After carefully studying the tables, it was revealed that Mars orbits the sun but not in a perfect circle. The only orbital shape that fits this observation is an ellipse (oval) shape with the sun as one of its focal points. However, Kepler realized that the key to unlocking the secrets of the sky was not Mars, but planet Earth. According to Professor Max Caspar, "Kepler's findings motivated him to try a genius approach". It uses the tables in an unusual way. Instead of using the tables to investigate Mars, Kepler imagined himself standing on Mars and looking down at Earth. He calculated that the speed of the earth's motion varies and is inversely proportional to the distance from the sun.
Now, Kepler understands that the sun is not simply the center of the solar system. The sun also functions like a magnet, rotating on its axis and influencing the motion of the planets. Caspar wrote, "This was a completely new concept which from then on guided him in his research and led him to the discovery of his laws". For Kepler, all planets are physical bodies harmoniously governed by a diverse set of laws. What he had learned from Mars and Earth must apply to all the planets. Thus, he concluded that each planet orbits the sun in an elliptical orbit at a speed that varies according to its distance from the sun.
Laws of Planetary Motion
In 1609, Kepler published New Astronomy, which is recognized as the first modern astronomy book and one of the most important books ever written on the subject. This masterpiece contains Kepler's first two laws of planetary motion. His third law was published in Harmonies of the World in 1619, while he was living in Linz, Austria. These three laws define the basics of planetary motion: the shape of a planet's orbit around the sun, the speed at which a planet moves, and the relationship between a planet's distance from the sun and the time it takes to complete one rotation.
How did Kepler's fellow astronomers react? They don't understand how important Kepler's laws are. Some even don't believe it at all. Maybe they can't be completely to blame. Kepler has shrouded his work with an elusive Latin prose like a thick layer of clouds that shrouds an almost impenetrable Venus. However, as time passed, Kepler's laws were finally recognized. Some 70 years later, Isaac Newton used Kepler's work as the basis for his laws of motion and gravity. Today, Kepler is recognized as one of the greatest scientists of all time—a man who helped drag astronomy out of the Middle Ages into modern times.