<< Chapter < Page Chapter >> Page >

Nicholas Copernicus (1473-1543) learned the works of Peurbach and Regiomontanus in the undergraduate curriculum at theuniversity of Cracow and then spent a decade studying in Italy. Upon his return to Poland, he spent the rest of his lifeas a physician, lawyer, and church administrator. During his spare time he continued his research in astronomy. The resultwas De Revolutionibus Orbium Coelestium ("On the Revolutions of the Celestial Orbs"), which was published inNuremberg in 1543, the year of his death. The book was dedicated to Pope Paul III and initially caused litle controversy. Ananonymous preface (added by Andreas Osiander, the Protestant reformer of Nuremberg) stated that the theory put forward inthis book was only a mathematical hypothesis: the geometrical constructions used by astronomers had traditionally had onlyhypothetical status; cosmological interpretations were reserved for the philosophers. Indeed, except for the first elevenchapters of Book I, De Revolutionibus was a technical mathematical work in the tradition of the Almagest .

Diagram of the Copernican system, from De Revolutions
But in the first book, Copernicus stated that the Sun was the center of the universe and that the Earth had a triple motion
A daily rotation about its center, an annual motion around the Sun, and a conical motion of its axis of rotation. This lastmotion was made necessary because Copernicus conceptualized the Earth's annual motion as the result of the Earth beingembedded in a spherical shell centered on the Sun. Its axis of rotation therefore did not remain parallel to itself withrespect to the fixed stars. To keep the axis parallel to itself, Copernicus gave the axis a conical motion with aperiod just about equal to the year. The very small difference from the annual period accounted for the precesion of theequinoxes, an effect caused by the fact that the Earth's axis (in Newtonian terms) precesses like a top, with a period ofabout 26,000 years. (Copernicus's ideas about this precession were more cumbersome and based on faulty data.)
around this center. His theory gave a simple and elegant explanation ofthe retrograde motions of the planets (the annual motion of the Earth necessarily projected onto the motions ofthe planets in geocentric astronomy) and settled the order of the planets (which had been a convention in Ptolemy's work)definitively. He argued that his system was more elegant than the traditional geocentric system. Copernicus still retained thepriviledged status of circular motion and therefore had to construct his planetary orbits from circles upon and withincircles, just as his predecessors had done. His tables were perhaps only marginally better than existing ones.

The reception of De Revolutionibus was mixed. The heliocentric hypothesis was rejected out of hand by virtuallyall, but the book was the most sophisticated astronomical treatise since the Almagest , and for this it was widely admired. Its mathematical constructions were easilytransferred into geocentric ones, and many astronomers used them. In 1551 Erasmus Reinhold, no believer in the mobility ofthe Earth, published a new set of tables, the Prutenic Tables , based on Copernicus's parameters. These tables came to be preferred for their accuracy. Further, De revolutionibus became the central work in a network of astronomers, who dissected it in great detail. Not until ageneration after its appearance, however, can we begin point to a community of practicing astronomers who accepted heliocentriccosmology. Perhaps the most remarkable early follower of Copernicus was Thomas Digges (c. 1545-c.1595), who in A Perfit Description of the Coelestiall Orbes (1576) translated a large part of Book I of De Revolutionibus into English and illustrated it with a diagram in which the Copernican arrangement of the planets isimbedded in an infinite universe of stars.

Questions & Answers

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Berger describes sociologists as concerned with
Mueller Reply
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply
Practice Key Terms 3

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Galileo project. OpenStax CNX. Jul 07, 2004 Download for free at http://cnx.org/content/col10234/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Galileo project' conversation and receive update notifications?

Ask