ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Dutch astronomy. Title page of a 1635 book written by the Dutch astronomer Johan Philip Lansberge (1561-1632). The text is in Latin, with the author's name at top. The book's title refers to the two instruments in the main artwork. At upper left is an astrolabe, used to predict the positions of the stars and other astronomical bodies. A quadrant (centre) is used to measure the angle of elevation of an astronomical body. Here, it is being used sideways (to avoid blindness) to measure the elevation of the Sun. The text at top refers to soldiers, geographers, and sailors using these instruments. At bottom is the date and place (Middelburg) of publication. Middelburg, the town where Lansberge died, is shown in the artwork.
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