Selections from Kepler's Astronomia NovaJohannes Kepler wrote Astronomia Nova (1609) in a singleminded drive to sweep away the ancient and medieval clutter of spheres and orbs and to establish a new truth in astronomy, based on physical causality. Thus a good part of the book is given over to a nontechnical discussion of how planets can be made to move through space by physical forces. This is the theme of the readings in the present module. The selection includes Kepler's Introduction as well as a selection of chapters that develop the physics of planetary motion. In these ground-breaking chapters, the true Kepler emerges, not as a speculative mystic or a number-crunching drudge, but as a first-rate scientific thinker with a wonderfully engaging narrative style. |
From inside the book
Results 1-3 of 45
Page 9
... motion is in the sun itself . It is therefore very likely that the source of the earth's motion is in the same place as the source of the other five planets ' motion , namely , in the sun as well . It is therefore likely that the earth ...
... motion is in the sun itself . It is therefore very likely that the source of the earth's motion is in the same place as the source of the other five planets ' motion , namely , in the sun as well . It is therefore likely that the earth ...
Page 11
... motion in some place other than the center of the world , you will find a metaphysical argu- ment in Chapter 9 , p . 322 of that book.9 Objections to the earth's motion . I trust the reader's indulgence if I take this opportunity to ...
... motion in some place other than the center of the world , you will find a metaphysical argu- ment in Chapter 9 , p . 322 of that book.9 Objections to the earth's motion . I trust the reader's indulgence if I take this opportunity to ...
Page 17
... earth's , at least where this resistance is negligible in proportion to that grasp . Consequently , anything shot vertically upwards falls back to its place , the motion of the earth notwithstanding . For the earth cannot be pulled out ...
... earth's , at least where this resistance is negligible in proportion to that grasp . Consequently , anything shot vertically upwards falls back to its place , the motion of the earth notwithstanding . For the earth cannot be pulled out ...
Contents
Introduction to the celestial motions | 29 |
The earth like other planets moves nonuniformly | 45 |
The sun is a magnet and rotates in its space | 63 |
Copyright | |
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Common terms and phrases
aethereal air angle aphelion appear Appendix argument Astronomia Nova astronomical axis carried celestial Chapter 32 circumference Copernican Copernicus demonstrated diagram diameter distances diurnal motion Donahue trans earth's motion earth's orbit eccentric anomaly eccentric circle epicycle equal equated anomaly eyes faculty force geometrical Green Lion heavens heavy bodies human hypothesis immaterial species Kepler Latin latitude law of sines light line of apsides magnetic Mars Mars's mathematical mean anomaly measure Mercury moon motive power mover moving power Mysterium cosmographicum nature observations opposite optical equation path perigee perihelion period planet moves planetary models position present proportional psalmodist Ptolemy ratio reader reciprocation rotation scripture second inequality semidiameters solar body solar theory space speed stars straight lines sun or earth sun's apparent sun's mean superior planets Taurus theory things tions translation traversed triangle tricity Tycho Brahe zodiac