# Marinus of Neapolis

### Quick Info

Neapolis, Palestine (called Shechem in Bible, now Nablus, Israel)

possibly Athens, Greece

**Marinus**succeeded Proclus as head of the Academy at Athens. He published some work on astronomy.

### Biography

**Marinus of Neapolis**was probably a Samaritan, but just possibly a Jew. He became a convert to the Greek way of life and joined the Academy in Athens where he was a pupil of Proclus who was head of the Academy. In fact when Proclus wrote a commentary on the

*Myth of Er*, he dedicated it to Marinus.

Marinus succeeded Proclus as head of the Academy at Athens in 485. We are told in [5] that:-

... he lectured on Pappus's commentary to Book V of the Almagest Ⓣ (in particular his discussion of parallax); and there are still extant lecture notes on the Data of Euclid.Marinus [2]:-

... wrote a commentary, or rather introduction to the Data of Euclid. It is mainly taken up with a discussion of the question - what is meant by given?In fact Marinus was a great believer in mathematics, something which he shared with fellow late Neoplatonists. He said (see for example [1]):-

I wish everything were mathematics.Although Marinus followed closely the views of his teacher, Proclus he did show originality which is much to his credit. The level of his regard for Proclus is evident in the biography that he wrote

*Life of Proclus*in which he [1]:-

... praised and eulogised [Proclus].Yet when Marinus felt that Proclus was in error he was quite prepared to give his own views. For example Proclus had claimed that Plato's

*Parmenides*was concerned with gods. Marinus, quite correctly, pointed out that Plato's work in rather concerned with 'forms'

The article [7] by Tihon is an interesting account of two previously unknown commentaries on astronomical topics by Marinus. One concerns the Milky Way and Marinus discusses whether it is affected by precession. As early as the 5th century BC Democritus had correctly understood the Milky Way to be due to a multitude of faint stars. However this was still not the accepted view in the time of Marinus, who argues against this hypothesis in this commentary. Marinus did claim, however, that the Milky Way was part of the sphere of fixed stars and so underwent precession in the same way as the fixed stars.

In the second commentary by Marinus described in [7], he corrects the rules for the direction of parallax in longitude given by Theon of Alexandria in his small commentary on Ptolemy's

*Handy Tables*. Marinus makes use of ideas by Pappus in making his corrections.

### References (show)

- R Walzer, Biography in
*Dictionary of Scientific Biography*(New York 1970-1990). See THIS LINK. - T L Heath,
*A history of Greek mathematics***I, II**(Oxford, 1931). - S Sambursky,
*Proklos, Präsident der platonischen Akademie, und sein Nachfolger, der Samaritaner Marinos*(Berlin, 1985). - M Michaux,
*Le Commentaire de Marinus aux Data d'Euclide : étude Critique*(Louvain,1947). - O Neugebauer,
*A history of ancient mathematical astronomy*(New York, 1975). - F Hopfner, Die Kartenprojektionen des Marinos und des Klaudios Ptolemaios,
*Anz. Akad. Wiss. Wien. Math.-Nat. Kl.***83**(1946), 77-87. - A Tihon, Notes sur l'astronomie grecque au Ve siècle de notre ère (Marinus de Naplouse - un commentaire au Petit commentaire de Théon,
*Janus***63**(1-3) (1976), 167-184.

### Additional Resources (show)

Other websites about Marinus:

Written by J J O'Connor and E F Robertson

Last Update April 1999

Last Update April 1999