the title of this book is baptized Aurora Consurgens—The Rising Dawn—and that for four reasons: Firstly, it is called Dawn as one should say the Golden Hour… the dawn is midway between night and day, shining with twofold hues, namely, red and yellow
The text supplies its own etymology of the title, establishing the aurora symbol as the threshold between darkness and illumination and correlating it with the alchemical rubedo and citrinitas.
, Aurora Consurgens: A Document Attributed to Thomas Aquinas on the Problem of Opposites in Alchemy, 1966thesis