Alcuni link online sulle stelle fisse, Thabit Ibn Qurra e la lunga quadratura Uranus-Plu., in English only (ahimè)

http://thewitchesalmanac.com/2014aslpheratz.pdf
http://www.terrynazon.com/fixedstars.html
http://islamsci.mcgill.ca/RASI/BEA/Thabit_ibn_Qurra_BEA.htm
http://www.jstor.org/discover/10.2307/1595894?sid=21105939331581&uid=4&uid=3738296&uid=2
http://www.lunarplanner.com/Uranus-Pluto-Square/
http://www.constellationsofwords.com/stars/Erakis.html

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