Our collection of Astronomy cards consist mostly of classification picture sorting cards, nomenclature cards and 3 part cards. to study the universe – to infinity and beyond! The objective of Montessori style nomenclature materials is to correctly match the picture card and label to their control. If you’d like to make nomenclature cards into 3-part cards, you match the picture and label cards to their descriptions. Sorting cards use minimal text (on the title cards) and focus mainly on images to classify.