margherita wrote:Obviously- to make Martin unhappy it should be the viam rationalem, quam iuxta Ptolemaei formam....

Oh, I don't take it personally. Since Renaissance astrologers made Ptolemy the single greatest authority of astrology, everyone who had an idea tried to foist it off as Ptolemaic. Regiomontanus and Maginus both did it (and so, of course, did Placidus), but they can't both be right; and in fact almost every historian in the field agrees that neither of them was. (Bezza is in the minority here.)

If I understand correctly it was translated by order of Alfonso X from Arabic into Castilian in 1259 by Yehuda Al-Cohen. Was Oneydalla an astrologer based in Muslim Spain?

Sorry, I never found any reliable information about him. Apparently he was also called Ubaidallah in an english translation (acc Jose Sanches Perez)

I think we should also honor Georg from Peuerbach as an important Astrologer as Astronomers.

Here is a short excerpt from ELECTRONIC NEWSLETTER FOR THE HISTORY OF ASTRONOMY

Published by the Working Group for the History of Astronomy:

....- Also in a scientific confirmation yet from time to time
owned and copyright dispute - Georg von Peuerbach or his students
Regiomontanus - brought Prof. Wolf-Dieter Mueller-Jahncke of the
University of Heidelberg about it, that the horoscope for Kaiser Friedrich
III. regarding his marriage to Eleanor of Portugal clearly
Georg von Peuerbach was assigned, even if only in a copy by
his most famous students is present. He also made the cessation of
that time is on astrology and it seems that since this
Horoscope for the Emperor in aristocratic circles it was "in" and since that important to have life stages assessed astrologically.

Prof. Dr. Wolfgang Kaunzner of the University of Regensburg clarified
out that George of Peuerbach with his book the "algorithm", that he has written as first an arithmetic book in the German speaking world, that Arab
Digits used - a harbinger (Precursor) of the much-quoted Adam Riese. A
double "quantum leap" in that is the calculation with the Arab
numerals compared to the previous use of Roman numerals
Arithmetic operations and has also greatly facilitated this
Instructions for computing a wider extent than previously was accessible. Dr. Samhaber could do one of his last year at Yale University,
USA, discovered very early copy of this work from Peuerbach to the end of the 15th Century show that the use of Arabic numerals by
Peuerbach proves. Later prints have namely those examples
omitted, as well as the cube root pulling, so that from the real
George's performance is not fully emerged. The speaker was about
this academic enrichment, which it previously was not known,
extremely happy. From the Benedictine monastery of Melk soon after the
Peuerbach's death came prepared copy about 70 years ago to America and presents the most authentic source of this important work by
Peuerbach.

Univ.-Prof. Dr. Maria Firneis, Institute for Astronomy of the
University of Vienna took place, the calculation of the height of the sun Georg of Peuerbach vividly after, with the incredible Spatial perception of the sky (Raumanschauungsvermoegen) of George of Peuerbach and refined
Calculations in spherical geometry by Georg von Peuerbach so
early stage were highlighted. They made it clear again that the
Peuerbach was the first one who detected, how its the calculations of "sinus secundus" as used today, and now are "cosinus" called.
The Exhibition in Peuerbach called "George of Peuerbach and the consequences," especially means these calculation methods, without which neither today the space nor the satellite navigation would be possible. She called to all scientists, even more to employ scientific with this famous Austrian astronomers, but also there are in in the
Austrian archives, numerous manuscripts not
worked up.

Wolfgang

Thanks Wolfgang,

I confess George of Peuerbach was a new figure to me. Clearly a consequence of my ignorance rather than his historical significance. So thats makes two Austrians on the timeline now!

I have updated the list with several other astrologers. I have also added in some of the important 12th century translators of Arabic astrological texts into Latin such as Gerard of Cremona, Adelard of Bath, Herman of Carinthia, and John of Seville.

Just for fun I may do a running count of the figures mentioned by nationality (modern). So far the list is weighed down with Italians, English and Germans. Of course its all about quality not quantity.

Mark

Thanks Mark

Unfortunately I was unable as yet to answer. Had some foreign visits to be completed abroad.
Anyway, I am pleased that two Austrians in the timeline now.
Although I know there some more "German" astrologers from the following time of Regiomontanus, as about George Tannstetter http://en.wikipedia.org/wiki/Georg_Tannstetter which had been physician of Maximilian I and II. But would that take too long, I think. But of interest are still his Astrological- Medical Writings, which are obviously outdated from today's perspective, anything, but they give a good insight into the medical treatment type of this time before.

Wolfgang
http://www.ncbi.nlm.nih.gov/pmc/article ... 90/?page=1
http://www.ncbi.nlm.nih.gov/pmc/article ... 90/?page=2

Hi Wolfgang,

Thanks! I will add your latest nomination on to the list.

So far the breakdown by nationality is as follows:

England: 29
Italy: 20
Germany: 14
France: 5
Poland: 5
Spain: 3
Scotland: 3
Austria: 2
Greece: 2
Croatia: 1
Denmark: 1

Total: 85

Clearly, the English language bias of myself and most historical research is distorting things. As Wolfgang suggested there are probably lots of German astrologers of note not yet listed. If so who are they? Its also true that the earlier steep decline of astrology in continental Europe meant that English astrology dominated most of the 17th century. Naturally, its not really a numbers game. As I suggested before we are hardly comparing like with like by accounting George Wharton and Johannes Kepler together. In terms of significance Kepler is obviously an immensely more significant figure. Still, adding in the nationalistic element is fun!

Want to restore national pride by demonstrating your country's vital contribution to medieval and renaissance astrology? Start proposing some of your astrologers to the timeline list!

What surprises me the most is the low number of Spanish and French astrologers compared to Germans or Italians. This may be a language issue again. Any more French or Spanish suggestions? Also I only have two astrologers of Byzantine origin listed. Any more ideas?

Thanks

Mark