Discurso cometologico, y relacion del nuevo cometa: : visto en aqueste hemispherio mexicano, y generalmente en todo el mundo: el año de 1680; y extinguido en este de 81: observado, y regulado en este mismo horizonte de Mexico.
A 1681 Spanish astronomical treatise on a comet seen over Mexico, printed in Mexico City by the widow of Bernardo Calderón and written by Joseph de Escobar Salmerón y Castro for a learned readership. Its one picture is an engraved coat of arms with a spread eagle above a chevron and three animal figures, framed by scrolling acanthus-like ornament and a ribbon bearing the motto Gaudeo, a usable model for heraldic cartouche and crest design.
