In this article, both Anaxagoras' theory of multiple worlds and the principles of his theory of matter are examined. It is argued that the five principles, which are set out explicitly in the extant fragments, (No Becoming, Indefinite Types, Universal Mixture, Predominance, and Infinite Divisibility) form a consistent set. Further, it is argued that the principle of Homoeomereity, which Anaxagoras attributes to Anaxagoras, is consistent with Anaxagoras' other principles and is likely to be a genuine principle of Anaxagoras' physics.

In Philolaus’ cosmology, the earth revolves around a central fire along with the other heavenly bodies, including a planet called the counter-earth which orbits below the earth. His theory can account for most astronomical phenomena. A common criticism of his theory since ancient times is that his counter-earth does no work in the system. Yet ancient sources say the planet was supposed to account for some lunar eclipses. A reconstruction of Philolaus’ cosmology shows how lunar eclipses occurring at certain times (...) of day cannot be explained by earth blocking the sun’s light. The counter-earth could explain these eclipses. (shrink)

Reports of lunar and solar eclipses are of interest to students of both history and the history of science. Used with care, they can anchor significant historical events in time. Greek literature, like that of other civilizations, has its fair share of such reports. Often they motivate the actions of characters or expose aspects of belief. Sometimes they shed light on the assumptions of the writer. There are three places in theHistoriesof Herodotus where the author mentions darkenings of the sky (...) (generally taken to be solar eclipses), which have narrative significance and which assist in dating the wars between the Lydians and the Medes (1.74) and between the Greeks and the Persians (7.37 and 9.10). (shrink)

In this article, both Anaxagoras’ theory of multiple worlds and the principles of his theory of matter are examined. It is argued that the five principles, which are set out explicitly in the extant fragments, (No Becoming, Indefinite Types, Universal Mixture, Predominance, and Infinite Divisibility) form a consistent set. Further, it is argued that the principle of Homoeomereity, which Anaxagoras attributes to Anaxagoras, is consistent with Anaxagoras’ other principles and is likely to be a genuine principle of Anaxagoras’ physics.

¿Cuál es el origen de todas las cosas? A pesar de su gran diversidad, ¿tienen una raíz común? ¿Tuvo el mundo un comienzo? ¿Cómo surgió la vida en la tierra? Tales preguntas, que aún provocan a los científicos, fueron formuladas por vez primera por los primeros pensadores griegos. Anaxágoras responde a ellas poniendo al inicio del tiempo una confusa mezcla de todas las cosas sobre la cual obró un ser llamado Intelecto, quien dio lugar al orden del mundo que hoy (...) contemplamos. Con ello, este autor presocrático comienza a plantear algunas cuestiones filosóficas que perdurarán hasta nuestros días: la constitución de la materia, la naturaleza del conocimiento sensorial e intelectual, la intervención de Dios en el mundo… Este libro pretende analizar cuidadosamente la filosofía de Anaxágoras prestando atención a los dos aspectos principales de su doctrina: la mezcla e Intelecto. Su comprensión de la realidad física como una mezcla tiene consecuencias filosóficas de gran interés y constituye quizá la más sugestiva entre las primeras concepciones de la materia. Por otro lado, Intelecto es, según Anaxágoras, quien provoca la variedad de los seres a través del movimiento. Así, nuestro filósofo distingue del sustrato material la causa de sus cambios, la cual se hallaría, además, dotada de inteligencia. Tales rasgos de la filosofía de Anaxágoras atrajeron la atención de los grandes filósofos clásicos, particularmente de Aristóteles. El segundo gran objetivo de este libro es, pues, recorrer el camino por el cual discurrieron las enseñanzas de Anaxágoras, desde que fueron expuestas por él en Atenas, justo durante el siglo que definió la preponderancia intelectual de dicha polis durante siglos, hasta que llegaron a oídos de Aristóteles, el testigo más determinante para comprender a Anaxágoras. (shrink)

My aim is to show that, in Posterior Analytics B 8, the conception of lunar eclipse brought about by pre-demonstrative knowledge (hoti) is deeply vague and radically different from the one obtained by demonstrative knowledge (dioti).