The booklet on the changes in the weather: De mutatione Aeris Libellus, a review

Readers of my blog know I don’t like repeating what others already have, myself I prefer finding pearls far from common place.
Anyway in writing a review of the new book of CieloeTerra, a translation  from Antonio Magini  with the introduction by  Prof. Giuseppe Bezza, is difficult to be as special as I desire, because who can define it less than perfect?

The book is called “De mutatione Aeris Libellus”, the booklet on the change in the weather, published in several editions from the first years of 1600 by Giovanni Antonio Magini, professor in charge of  the chair of Mathematics in one of the most important Italian universities,  Bologna, and astrologer in Gonzaga court.

In every case the border between the two activities was not so deep  because the curriculum studiorum of a student of Bologna University would include Sacrobosco’s Sphaera and Tetrabiblos and the use of astronomical tables and instruments like the astrolabe and the quadrant. (( Angus G. Clarke,  Giovanni Antonio Magini and the late Renaissance astrology, PHD thesis, Warburg Institute, University of London, 1985))

This is Antonio Magini birth chart: (( Antonio Favaro, Carteggio inedito di Ticone Brahe, Giovanni Keplero e di altri celebri astronomi e matematici dei secoli XVI. e XVII. con Giovanni Antonio Magini, tratto dall’Archivio Malvezzi de’ Medici in Bologna, 1886 ))

Padua, 14th June 1555 OS from Tabulae primi mobilis, quas directionum vulgo dicunt (Venetiis : Apud D. Zenarii, 1604)

This booklet on weather forecasts – a section of Ephemerides caelestium motuum (( Giovanni Antonio Magini. Ephemerides coelestium motuum Io. Antonii Magini Patavini, … ab anno Domini 1611 vsque ad annum 1630 iusxta Copernici obseruationes accuratissimè supputatæ, correctæ, & auctæ, ad longitudinem inclyta Venetiarum urbis …: quibus additum est eiusdem Supplementum isagogicarum ephemeridum. Venetiis: Apud Hæredem Damiani Zenarij, 1616. ))  is mostly based on Ptolemy and on the refusal of some parts of  Arab astrology, like the Moon mansions generally used in weather forecasts, but saving other ones like the opening of the doors.

For this reason the coming season will mostly depend on the sizygy preceding the Ingress of the Sun in the cardinal signs rather than the Ingress itself  and its rulers will be chosen considering together with the rulers of the conjunction (or the opposition) the rulers of the  following angle,  rather than the Ascendant.

The author goes on explaining the quality of the seasons and of the images of the starred Zodiac (updating them to the moment he writes) and the way we can forecast the weather for each month of the year.

The qualities of the planets in general and how they vary according to their phase to the Sun and orbit ,  the aspects, detailing every combination, and the so-called “opening of the doors”, which is an aspect between planets which have opposite domicile, Saturn with the Sun or the Moon, Jupiter and Mercury, Mars and Venus.

Pages 45-55 are devoted to the influence of fixed stars on weather, while the rest of book is about the nature of the winds and how fixed stars produce their peculiar winds when they rise or set with the Sun.

So, for example

Spica rising or setting with Mercury makes winds and clouds and sometimes with rains and the same the stars of the Charioteer, or the the Virgo belt or the Scales or the Triangle stars, or the ones of Hercules or of Aquarius.

The text presents both Latin original and Italian translation cura Prof. Giuseppe Bezza and Joe Fallisi.

In Appendix the tables of the stars compiled by Marco Fumagalli from Astrognosia synoptice et methodice in usum gymnasiorum & academiarum adornata, printed in Wittemberg in 1659, with name, Bayer letter, correspondent name used by Magini, magnitude, equatorial coordinates for 1600 and 2000, dates for some cosmical and heliacal phases for Rome  pole  in 1600 and 2000.

Everybody. At the present moment several astrologers are involved with astrological weather forecasts – the same Cieloeterra has its page written by Patrizia Zivec- and the booklet obviously could be precious for them. But it is not enough. Every traditional astrologer should read it, because this is a book on the general principles of astrology: the qualities of planets, their temperament according their phase to the Sun, the choice of the rulers of a chart, and so on because

prognostication by astronomical means is divided into two great and principal parts, and since the first and more universal is that which relates to whole races, countries, and cities, which is called general, and the second and more specific is that which relates to individual men, which is called genethlialogical, we believe it fitting to treat first of the general division, because such matters are naturally swayed by greater and more powerful causes than are particular events. And since weaker natures always yield to the stronger, and the particular always falls under the general, it would by all means be necessary for those who purpose an inquiry about a single individual long before to have comprehended the more general considerations.

The book costs 10 (TEN) euros and it can be required to the publishing house Renato Varani, Edizioni Colibrì, or  at 1/2 of its price, 5 euros + shipping costs only for Cieloeterra members, ( the yearly subscription fee is 30 euros  ) directly to CieloeTerra.

Info:  Cieloeterra site, at the page EDIZIONI (which soon will show details about the book).

Giovanni Antonio Magini. De Mutatione Aeris Libellus. Latin and Italian version, cura Giuseppe Bezza and Joe Fallisi, Edizioni Colibri, 2010. Pages:93

Written by Margherita Fiorello, CIDA certified member, for heaven astrolabe blog @ year 2010. If you want to be notified the next time I write something, subscribe to my RSS feed.




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