A chart of the zodiac constellation Cancer with transparent ‘stars’

A chart of the constellation Cancer, unusually depicted as a lobster rather than a crab. The outline of the crustacean is pricked out with yellow shaped holes for the stars, so they are illuminated when the card is held up to the light. The stars are shaped to represent their apparent magnitude. From Braun's 'Himmels-Atlas in transparente Karten'.