This Old Map…
In 1647, Polish astronomer Johannes Hevelius published the Selenographia sive Lunae Descriptio (Selenography or the description of the moon). [Ed Note: Selenography is named after the Greek moon goddess Selene.]
Historian of astronomy Albert Van Helden explains:
In Selenographia he presented engravings of every conceivable phase of the Moon as well as three large plates of the full Moon: one of the ways the full Moon actually appeared through the telescope, one the way a maker of terrestrial maps might represent it (using the conventions of geographers), and one a composite map of all lunar features illuminated (impossibly) from the same side.
Hevelius’ lunar map influences astronomy, cartography, and navigation to this day by introducing us to longitudinal lines, necessary during the Age of Discovery when navigators had to figure out the difference between their local time and a distant reference point (the moon). They needed “a composite view that pictured the Moon in a way it never appeared in reality but was accurate in its placement of individual features,” Van Helden writes.
Did you know?
A large crater on the western edge of the Ocean of Storms is named after Hevelius?
Editor Note: If you enjoyed this Cartography post, check out the first in the series, Cartography and World Building. Let me know what else you’d like to see…