The Face of the Moon

6. Divini, Eustachio (1610-1685).

"Lunae facies," plate 19 in: Guericke, Otto von. Experimenta nova -- Amsterdam: apud J. Janssonium a Waesberge, 1672.

In 1649 the telescope maker Divini published a moon map as a separate broadsheet, primarily to advertise the quality of his lenses. The Divini map was then twice included in printed books: first in Athanasius Kircher's Mundus Subterraneus (1665); subsequently in Guericke's book, which is more famous for its descriptions of experiments with the air pump. Both works are in the Library's collection, but the Guericke version, although smaller and later, is better engraved and less well known.

image - click to enlarge

While Divini's map is usually treated as his own handiwork, it is evident that he had one eye at the telescope and the other on the work of his predecessor Hevelius. Compare the southeast quadrants, and if one discounts the different engraving styles, the similarities between the two are apparent, especially the rabbit ears of Stevinus and Furnerius at the bottom, and the pancaked appearance of the maria at right. Additional evidence of copying can be found in Divini's rendition of the region around Kepler, in his perception of a triangle in the Lacus Mortis (Sea of Death) in the north, and in the pattern of the ray system emanating from Tycho. However, there are also enough differences to indicate that Divini did make many observations on his own.

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