The Most Important Figures in the History of Astronomy

Pythagoras (582 – 507 B.C)

A famous pre-Socratic era Hellenic philosopher, Pythagoras of Samos, Ionia, is for the most part best-known through his work as registered by his followers, the Pythagoreans. His followers thought that everything in the cosmos, including abstract thoughts, could be measured and carried in mathematical measures. Maybe what Pythagoras is most celebrated for is his uncovering of the Pythagorean theorem. Basically, the theorem assisted early mathematicians including Euclid to constitute presumptions and assist encourage the maths. In the area of the ascending scientific discipline of pre-astronomy, Pythagoras made-up a route for afresh astrology that enclosed an ingredient of practical maths, which would demonstrate assistive in the futurity of astronomy.

The Pythagorean Theorem evidences that the aggregate of the squares of the distances of the sides of a right trigon is equal to the square of the distance of the hypotenuse. This validation became really prosperous in the computation of astronomic lengths.


Ptolemy is the Greek philosopher and astronomer who allowed for the most capital bequest to the succeeding of astronomy. He’s the 3rd of the known Alexandrian men, living almost 150 A.D. He had accession to the wealthiness of cognition imparted by more former scientists, and from this, he synthesised the initiative extensive model of the cosmos. Aristotle applied the philosophic model, and Ptolemy made a particular numerical framework settled upon his educational activities.

Ptolemy was incommoded that the latest cosmos opinion could not regurgitate or forecast precisely certain watched phenomena, for example planetal backward motility, and the info that Mars seems denser from time to time. Thus he set out to formulate afresh system of rules, whereby he employed Euclid’s geometry to the cosmos. Under the Ptomlemaic system of rules, planets revolved circa the planet on a deferential, which is just a circle round Earth. But Ptolemy stated that the deferential didn’t have the earth at the core, but were alternatively off-centred. An eccentric is a deferential with the earth somewhat off-centered.

Ptolemy enounced that planets seem to accelerate and decelerate since they don’t center on the earth at a homogeneous range. As an alternative, he came up a point, the equant, which was same and diametric the earth from the centre. If a person were to standstill at the equant, he would find out the earth rotating at a consistent rate. Eventually, to explicate retrogressive movement, Ptolemy designated that the earth followed a epicycle, or a sub-orbit. This epicycloid followed the deferent.

This framework, firstly coming into court in Ptolemy’s volume Almagest, was the 1st to tackle evident incongruousnesses in the Aristotelean modelling. It’s perplexed since Ptolemy sensed the motivation to keep Plato and Aristotle’s law of nature that planets get in undifferentiated round movement at a homogenous rate. His example granted this to materialise while allay explicating how come off-centered observances go on, and was the classical schoolbook for astronomic discipline until Nicolaus Copernicus. Michael Maestlin, the coach of Johan Kepler, in reality possessed a transcript of Almagest, and Kepler was invoked with Ptolemy’s Earth perspective.
Nicolaus Copernicus (1473-1543)

Romanised name of Niclas Kopernik, the identify of the founding father of the Copernican planetary theory; born at Torun (Thorn), 19 Feb, 1473, passed away at Frauenburg, 24 May, 1543. Nicolaus Copernicus projected that a circumvolving Earth orbiting with the additional planets about a fixed primal Sun could describe in a less complicated process for the equal detected phenomena of the regular gyration of the heavens, the yearly motion of the Sun through the ecliptic, and the cyclic retrogressive motility of the planets. He was encouraged to print his hypotheses, but he was unwilling to do so. All the same, he softened and did release them; they were passed on to him the same day he passed away.

Johannes Kepler (1571-1630)

The Germanic astronomer was the 1st heavy admirer of the Copernican theory of Nicolaus Copernicus and the finder of the 3 laws of planetary movement. All of the time channelized by the conception of marvel in the structure of the cosmos, and specifically by a hypothesis of harmoniousness in geometrical anatomies, numerals, and music, Johannes Kepler, in his Harmonices mundi (Harmonies of the World, 1619), declared his 3rd law; a connection between the orbital time periods and the outdistances of the planets from the Sun. His notion that the Sun shapes the speed of the planets was a milepost in scientific idea, placing the base for Sir Isaac Newton’s theory of universal gravitational force. The late Somnium on which Kepler drove till shortly before his dying, is declarative of his productive intellect. In that work, Johan Kepler depicts a travel to the Moon and talks about the world of lunar inhabitants. An all-important link up between the thinking of Nicolaus Copernicus and that of Isaac Newton, Johannes Kepler was an authoritative envision in the 17th-century scientific revolution.
Galileo Galilei (1564-1642)

Galileo Galilei studied practice of medicine at the university of Pisa, but his actual concerns were forever in maths and physical science. He’s mainly called back for his work at free fall, his practice of the telescopes and his utilisation of experiments. In 1592 Galileo Galilei was nominated professor of maths at the university of Padova (the university of the Republic of Venezia). In that location his responsibilities were primarily to instruct Euclid’s geometry and accepted (Ptolemaic) astronomy to medical scholars, who’d demand to cognize a few astronomy in order to make the best of star divination in their medical exercise. Nevertheless, Galileo Galilei evidently talked about less lawful anatomies of astronomy and physics in a public speech he submitted relationship with the visual aspect of a New Star (at present called Johannes Kepler’s supernova) in 1604. In a personal letter composed to Johannes Kepler in 1598, Galileo Galilei had expressed that he was a heliocentric (truster in the hypotheses of Nicolaus Copernicus). No common sign of this impression was to come out until numerous years later.

In the summertime of 1609, Galileo Galilei got word about a glass that a Hollander had demonstrated in Venezia. From these stories, and applying his personal technical accomplishments as a mathematician and as a working man, Galileo Galilei created a series of scopes whose optic execution was much finer than that of the Dutch tool. The astronomic breakthroughs he brought in with his telescopes were depicted in a brief book addressed Message from the stars (Sidereus Nuncius) printed in Venezia in May 1610. It stimulated a whizz. Galileo Galilei exacted to have discovered mountains on the Moon, to have evidenced the Milky Way Galaxy was comprised of petite stars, and to have checked 4 humble bodies revolving Jupiter.

These last discoveries, with an aim acquiring a job in Firenze, he quickly called ‘the Medicean stars’. At that place finally watched some look of concern by the Inquisition. According to the Holy Christian church, Copernicanism was in contradiction in terms with Word of God, and in 1616 Galileo Galilei inclined some sort of hidden, but authoritative, cautionary that he wasn’t to guard Copernicanism. Just what was ordered on this affair was to turn a case for conflict when Galileo Galilei was impeached of going away from this attempting in his Dialogue touching on the 2 biggest world systems , printed in Firenze in 1632. Galileo Galilei, who wasn’t in the finest of wellness, was mobilized to Rome, determined to be vehemently distrusted of heterodoxy, and finally sentenced to home arrest, for lifespan, at his villa at Arcetri. He was besides necessitated to say an oath in front of the sacred Church of Rome in which he was pushed to relinquish his belief that the Sun was at the centre of the Solar system.
Prentice Hall Science Explorer Astronomy P

This article was written by JEFF

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