The brightest luminaries of earth give names to the dusky spots in the selenography of Helvetius.
It is a tough problem in selenography to account for these streaks.
Langrenus was the first to do serious work on selenography, and named the lunar features after eminent men.
selenography, in the modern sense, is little more than a hundred years old.
These, and a few other similar instances, are all that selenography has to offer by way of evidence of actual lunar change.
For many years, accordingly, Schmidt had the field of selenography almost to himself.