The Astronomer shows a young man in a scholar’s robe standing at a table, one hand resting on a celestial globe, the other on the table beside it. He is not looking at the globe but past it, out of the window, as if following a thought. On the wall behind him is a cupboard, and on the table a book, an astrolabe and a chart. The light comes from a window on the left and falls across the globe, the man’s face and the folds of his robe.
The painting is one of a pair with The Geographer in Frankfurt, and both are usually identified as the same model - possibly Antonie van Leeuwenhoek, the Delft draper and microscopist who was a friend of Vermeer’s and later became famous as a scientist. The globe in the painting is by Jodocus Hondius and shows the constellations of the northern sky.
Vermeer’s interest here is the relationship between knowledge and light. The astronomer is surrounded by instruments, but the painting is not about measurement; it is about the moment of understanding, when a man stops looking at his tools and looks up. The work was acquired for the French royal collection in 1785 and has been in the Louvre since 1793.