The image is a photograph of a book titled "Two Devices with Gearwheels". The book is written in black text on a beige background. The title is written at the top of the page in bold font. Below the title, there is a subtitle that reads "Aristotle, who is probably the author of Mechanika, offers a remarkable description regarding motion transmission by means of several bronze or iron discs. The author is referring to a small device containing many little wheels, which is a type of wheel that can be used to measure the speed and direction of a celestial object. The instrument is described as "Two Astronomical Instruments". 

The image also includes a brief description of the instrument, which states that it is a planisphere astrolabe, known simply as astrology, is a disk-shaped instrument used in the measurement of time, the determination of the place of the celestial bodies as well as the astronomical instrument whose rings represent the celestial globe according to the Latin word armillary bracelet. It also mentions that it was named "Circles of Spherical Celestial Geometry."

At the bottom of the image, there are two bullet points that explain the instrument and its purpose.