Gemma Frisius, R....De principiis astronomiae et cosmographiae... Antwerpen, 1553.
Dutch mathematician, astronomer, cartographer, maker of various mathematical navigational and astronomical devices and globes Reiner Gema Frisius‘s (1508–1555) treatise On astronomy and cosmography principles... reprinted several times
In this treatise R. Gemma Frisius presented the illustration of his astronomical rings (lot. annulus astronomicus; else called Gemma‘s rings) for the first time
