Dated to the early twentieth century, this planetary model was made by Laing Planetarium Company in Detroit, United States. Called an orrery, or more correctly a tellurium it is a demonstration model to show the motions of the Earth and Moon around
Made by Richard Melbourne in London during 1631, this brass astrolabe enabled explorers/sailors to identify their position based on how the sky looked during a specific time. This allowed men to orient themselves in unknown places. As physics progressed, this invention came about during an age of exploration and guided Europeans towards every corner of the globe. Without scientists solving more complex math problems, items like this would cease to exist.
This astrolabe was made in Germany in the 17th century, a time when astrolabes were already on the verge of decline in the West. It is remarkable for its fanciful stellar markers (usually just sharp pointers, for the sake of precision) and for including the comet of 1618 and the novae of 1572, 1600, and 1604. (Adler Collections, M-34.)