The map of the solar system

Description
The customer is only 12 years old. She likes to learn foreign languages. Therefore, the motto on the top is written in an unfamiliar Latin language. The dial is decorated with the scheme of the solar system. In due time, she will decipher symbols forming the line in the bottom of the dial. In particular, she will learn why the planet Gershel has been renamed into a planet Uranium and why the symbol of this planet keeps William Gershel's initials.