Materials: oil on oak. Dimensions: 15.3 x 12.7 cm. Nr.: NG2589. Acquisition: Salting Bequest, 1910. Source: http://www.flickr.com/photos/gandalfsgallery/5555510902/in/photostream. The young astronomer holds a celestial globe with constellations shown in the form of animals. Among those visible are some of the northern and zodiacal constellations: at the top, Draco; on the left, Ursa Major and, below it, Leo; on the right, beneath the encircling brass ring, Bubuleus. The stand for the globe is on the right, and a quadrant is in the foreground.
The attribution and dating depend on the similarity of this picture with a painting of an astronomer, dated 1685 and signed by van Deuren (New York, Christophe Janet, 1978). The model and globe appear to be the same in both works (http://www.nationalgallery.org.uk/paintings/olivier-van-deuren-a-young-astronomer).