## Nicolaus Copernicus and Johannes Kepler:

## Astronomers Extraordinaire

*Notable Quotes*:

*"*Finally we shall place the Sun himself at the center of the Universe. All this is suggested by the systematic procession of events and the harmony of the whole Universe, if only we face the facts, as they say, `with both eyes open'.*" Copernicus*

**1543 AD** Copernicus publishes "De revolutionibus orbium coelestium" (On the revolutions of the heavenly spheres). This is the source of the Copernican theory, namely that the Sun (not the Earth) is at rest in the centre of the Universe.

More at http://www-gap.dcs.st-and.ac.uk/~history/Chronology/1500_1600.html#1543

## Biographical Info

**Copernicus Bio Info MacTutor Site**

http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Copernicus.html

**Kepler Bio Info MacTutor Site**

http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Kepler.html

**Copernicus Activities:**

JPL Site with elementary age activities: http://education.jpl.nasa.gov/educators/angular.html

**Kepler Activities: **

http://plus.maths.org/issue25/reviews/book4/

Heavenly Mathematics: Cultural Astronomy

http://www.math.nus.edu.sg/aslaksen/teaching/heavenly.shtml

Hands On Universe Explorations http://hou.lbl.gov/~vhoette/Explorations/

How Far Is It Quiz http://www.handsonuniverse.org/activities/whatisit/SolSys.html