The image depicts a man seated facing slightly to the right with his head turned towards the viewer. He has a long face, a mustache, and wavy hair falling to his shoulders. He is wearing a dark coat with a large white collar. In front of him, there is an open book with his right hand resting on it and his left hand on a globe-like object with stars and zodiac symbols. In the background, there are hills, a tree, a crescent moon, a sun, and stars in the sky. The text at the bottom identifies the person as Johannes Gadburis.