RESUMO
At first sight, the English astronomer John Bainbridge's treatise on the great comet of 1618 appears rather idiosyncratic. It regards the comet as a favourable omen and applies an astrological explanation that is completely metaphorical. At closer look, however, Bainbridge's interpretation appears well in line with the meaning commonly attributed to comets at the time. We should realize that an important function of the discourse on prodigious phenomena, such as comets, was to uphold and strengthen the confessional social order. Moreover, the treatise was addressed to the King rather than to the common population. To understand the early modern interpretation of comets, the processes of confessionalization and de-confessionalization deserve more consideration.
