De prodigiosa specie, naturaq[ue] cometae, qui nobis effulsit altior lunae sedibus, insolita prorsus figura, ac magnitudine, anno 1577 plus septimanis 10. apodeixis tum physica tum mathematica

ON THE PRODIGIOUS
APPEARANCE AND NATURE OF THE COMET
WHICH SHONE UPON US, HIGHER THAN THE SEAT OF THE MOON,
with an altogether unusual figure and magnitude, in the year 1577, for more than 10 weeks.
A physical as well as mathematical demonstration.

ADDED TO THESE IS AN EXPLANATION OF TWO
CHASMS original: "Chasmaton"; refers to celestial phenomena or atmospheric lights of the year 1575, as well as a certain epilogistic assertion from the phenomena of several comets regarding their common nature, the causes of their generation, and their decrees, beyond what has been noted hitherto by the Peripatetics original: "Peripateticis"; the school of Aristotle.

BY D. CORNELIUS GEMMA,
of Louvain, Professor of Medicine, Ordinary and Royal.

A printer's mark depicts a compass drawing a circle, with the motto "LABOR AND CONSTANCY" inscribed around the border.

ANTWERP,
From the workshop of Christopher Plantin,
Royal Arch-typographer.

M. D. LXXVIII.