A detailed seventeenth-century engraving by Louis Cossin featuring the astronomer Giovanni Domenico Cassini with his scientific instruments.

This engraving by Louis Cossin depicts the astronomer Giovanni Domenico Cassini, also known as Jean-Dominique Cassini. The portrait captures the subject in a three-quarter view, dressed in the formal attire of the seventeenth-century scientific elite. His long, flowing wig and lace cravat reflect the fashion of the period, while his posture conveys a sense of intellectual authority.

Cossin employs precise line work to define the textures of the subject's clothing and the soft modelling of his features. In the background, a window reveals an outdoor scene featuring an observatory building and a large telescope, which serves to identify Cassini's professional identity as an astronomer. His hand rests upon a celestial globe, further reinforcing his connection to the study of the heavens. The composition is balanced, with the figure occupying the foreground and the scientific instruments providing a narrative context for his life's work.

Louis Cossin was a French engraver who produced numerous portraits of notable figures during the late seventeenth century. His technical approach relies on the controlled use of hatching and cross-hatching to create depth and shadow, a common practice among printmakers of the era. This work is a fine example of the portrait engraving tradition, where the subject is presented alongside symbols of their profession to communicate their status and achievements to the viewer. The print offers a clear look at the intersection of portraiture and scientific documentation in the Baroque period, providing a visual record of one of the most influential astronomers of the time.