Solution

The phrase "song is man's sweetest joy" was written by the poet Musaeus, whose mother was reputed to be Selene, and is a clue to the theme of the puzzle: the moon. The following list contains clues to six famous scientists, poets, mythological people etc. Each of these people is an eponym for a crater on the moon. By taking the coordinates of these craters and finding the corresponding position on the Earth, one ends up in six different countries. The first letters of these countries spells "Mzimba", which is a city in Malawi. The final sentence is a reference to the time it takes for light to travel back and forth between the Earth and Moon, which is a clue that one needs to go back to the Moon. By taking Mzimba's coordinates on the Earth as coordinates on the Moon, one finds another crater and the answer to the puzzle, Daguerre.