About Me

Eudoxus - The Six Keys Of Eudoxus (28.0 Kb)

Cover of Eudoxus's Book The Six Keys Of EudoxusBook downloads: 404
Eudoxus of Cnidus (410 or 408 BC - 355 or 347 BC) was a Greek astronomer, mathematician, physician, scholar and student of Plato. Since all his own works are lost, our knowledge of him is obtained from secondary sources, such as Aratus's poem on astronomy. Theodosius of Bithynia's Sphaerics may be based on a work of Eudoxus. Note that, unfortunately, not all my books can be downloaded due to the restrictions of copyright. However, most of the books on this site do not have copyright restrictions. If you find any copyright violation, please contact me at . I am very attentive to the issue of copyright and try to avoid any violations, but on the other hand to help all fans of magic to get access to information.
Editors Rating Eudoxus's Books List
Eudoxus Biography
Community Rating
Download All Books
If you are having difficulty downloading books, or you are looking for a book that is not on the site (but maybe it is in my home library), please write me a email to and I will try to help, I can send the book by e-mail
Donate Cryptocurrency
Bitcoin (BTC) Address:3CyHyov1fMUnJj6J6GRYyB4NV7U1j1FvWb
Bitcoin Cash (BCH) Address:bitcoincash:ppx42986wtem2wsx4dx250csz5vyfhqjay3md07ukj
Etherium (ETH-ERC20) Address:0xbaf043072ee102cb737765d19c97a5fa336df517
Litecoin (LTC) Address:LWZzWgmnyPC6of8breqwxyCWwqgCiFmNvf
Dogecoin (DOGE) Address:D9mHh7TJcY7BAC4i96f3f4GgDEX4MVXDXd
Monero (XMR) Address:4GdoN7NCTi8a5gZug7PrwZNKjvHFmKeV11L6pNJPgj5QNEHsN6eeX3DaAQFwZ1ufD4LYCZKArktt113W7QjWvQ7CW9pjKFNhv1QM62k3MM
ZCash (ZEC) Address:t1Yg6o3vA4rMAVbE8CX26LcH7cwN7k3x8kZ
Dash (DASH) Address:XeAdGAqN1KazEXPspmMGrQWJGuqVBNUPeR

darkbooks.org began in early 2008 I am happy to donate my time to providing you this resource, I would also like to note, that, although I try, I do not always have enough time to deal with the site, including, unfortunately, I do not always have time to answer all letters, because I have to earn money for a living. If you can financially help me, it would free me from the worries of earning money for living, perhaps partially, but ideally completely, then all 100% of my time could be devoted to the site. Also I do pay monthly web server/files storage and hosting costs to keep this site on the air. Please consider making a donation to help me continue this activity and devote more time to it or at least offset the cost of paying for storage/hosting. Even a small contribution helps!

Category 1:  Mystic and Occultism
Category 2: 
Category 3: 
Author:      Eudoxus
Format:      eBook
Eudoxus of Cnidus (410 or 408 BC - 355 or 347 BC) was a Greek astronomer, mathematician, physician, scholar and student of Plato. Since all his own works are lost, our knowledge of him is obtained from secondary sources, such as Aratus's poem on astronomy. Theodosius of Bithynia's Sphaerics may be based on a work of Eudoxus.

About Author:

Eudoxus of Cnidus (Eudoxos ho Knidios; 408-355 BC) was a Greek astronomer, mathematician, scholar and student of Plato. All of his works are lost, though some fragments are preserved in Hipparchus' commentary on Aratus's poem on astronomy. Theodosius of Bithynia's important work, Sphaerics, may be based on a work of Eudoxus.

Eudoxus is considered by some to be the greatest of classical Greek mathematicians, and in all antiquity second only to Archimedes. He rigorously developed Antiphon's method of exhaustion, a precursor to the integral calculus which was also used in a masterly way by Archimedes in the following century. In applying the method, Eudoxus proved such mathematical statements as: areas of circles are to one another as the squares of their radii, volumes of spheres are to one another as the cubes of their radii, the volume of a pyramid is one-third the volume of a prism with the same base and altitude, and the volume of a cone is one-third that of the corresponding cylinder.

Identifying the astronomical work of Eudoxus as a separate category is therefore a modern convenience. Some of Eudoxus' astronomical texts whose names have survived include:

- Disappearances of the Sun, possibly on eclipses
- Oktaeteris, on an eight-year lunisolar cycle of the calendar
- Phaenomena and Entropon, on spherical astronomy, probably based on observations made by Eudoxus in Egypt and Cnidus
- On Speeds, on planetary motions

Aristotle, in The Nicomachean Ethics attributes to Eudoxus an argument in favor of hedonism, that is, that pleasure is the ultimate good that activity strives for. According to Aristotle, Eudoxus put forward the following arguments for this position:

- All things, rational and irrational, aim at pleasure; things aim at what they believe to be good; a good indication of what the chief good is would be the thing that most things aim at.
- Similarly, pleasure's opposite ? pain ? is universally avoided, which provides additional support for the idea that pleasure is universally considered good.
- People don't seek pleasure as a means to something else, but as an end in its own right.
- Any other good that you can think of would be better if pleasure were added to it, and it is only by good that good can be increased.
Of all of the things that are good, happiness is peculiar for not being praised, which may show that it is the crowning good.

Many of the early commentators believed that Plato was the inspiration for Eudoxus's representation of planetary motion by his system of homocentric spheres. These view are still quite widely held but the article argues convincingly that this is not so and that the ideas which influenced Eudoxus to come up with his masterpiece of 3-dimensional geometry were Pythagorean and not from Plato.

As a final comment we should note that Eudoxus also wrote a book on geography called Tour of the Earth which, although lost, is fairly well known through around 100 quotes in various sources. The work consisted of seven books and studied the peoples of the Earth known to Eudoxus, in particular examining their political systems, their history and background. Eudoxus wrote about Egypt and the religion of that country with particular authority and it is clear that he learnt much about that country in the year he spent there. In the seventh book Eudoxus wrote at length on the Pythagorean Society in Italy again about which he was clearly extremely knowledgeable.

Source: wikipedia