Mapping the heavens has been a focus of cartography for as long as mapping the earth has been. Celestial maps range from system maps of the entire Universe and the constellations of stars to maps of planets and moons. The atlas map shown in this case, the 1850 “Revolution annuelle de la terre autour du soleil,” is a system map, beautifully portraying the relationship of the earth to the sun during the months and seasons of the year. (It is also the theme map of the exhibition.) The map and image “Moon – 6th Day” is one of 11 maps in Ball’s 1892 Atlas of Astronomy that show the moon progressing from new to full, using outline drawings and photograph-like images to depict its surface.