the fifteen-year-long twilight that reigns over that portion of the globe of Saturn
astronomy
пятнадцатилетние сумерки
Сумеречный период, длящийся пятнадцать лет.
A Honeymoon in Space
A Honeymoon in Space is a 1901 novel by George Griffith. It was originally serialized in abridged form in Pearson's Magazine in 1900 under the title Stories of Other Worlds. The scientific romance story depicts a tour of the Solar System, a type of story that was in vogue at the time.