https://www.academia.edu/9841145/On_the_Heavenly_Spheres
![](https://history.vonabisw.de/wp-content/uploads/2023/01/image.png)
Dr. Luis Ribeiro – Historical research Astrological Techniques
–https://astrotalk.vonabisw.de/dr-luis-ribeiro-historical-research-astrological-techniques
Astrologiegeschichte – History of Astrology
Volker H. Schendel – Ministerialrat i.R. – Sapere Aude – Carpe Diem – Nada Brahma
https://www.academia.edu/9841145/On_the_Heavenly_Spheres
–https://astrotalk.vonabisw.de/dr-luis-ribeiro-historical-research-astrological-techniques