Syzygia (astrologia)
Syzygia in astrologia est coniunctio planetarum vel trium vel plurum qui linealiter ordinatos esse ab observatoribus terrestribus videntur. Tales syzygiae astrologis et prophetis utiles esse censentur ad res futuras praedicendas.

Index syzygiarum 

 Syzygia anni 1186
 Syzygia anni 1345
 Syzygia anni 1524

Bibliographia 
 Bernard R. Goldstein, David Pingree, "Levi ben Gerson's Prognostication for the Conjunction of 1345" in Transactions of the American Philosophical Society vol. 80 pars vi (Philadelphiae, 1990)
 Hermann von Grauert, "Meister Johann von Toledo" in Sitzungsberichte der Bayerischen Akademie der Wissenschaften, phil.-histor. Kl. (Monaci, 1901) p. 165 ff.
 Michael R. Molnar, The Star of Bethlehem: The Legacy of the Magi. Rutgers University Press. ISBN 0-8135-2701-5 de hoc libro

Nexus externi 
 "Medieval End of the World Hoaxes" apud about.com 
 Mark Strauss, "Ten Notable Apocalypses That (Obviously) Didn’t Happen" apud smithsonian.com

Astrologia

it:Sizigia#Simbologia