Mercury (planet) at a steep angle. Mercury is 10° above the horizon when the planet appears directly above the Sun (i.e. its orbit appears vertical) and is at maximum elongation from the Sun (28°) and also when the Sun is 18° below the horizon, so the sky is just completely dark. This angle is the maximum altitude at which Mercury is visible in a completely dark sky. At middle latitudes, Mercury is more often and easily visible from the Southern Hemisphere than from the Northern. This is because Mercury's maximum western elongation occurs only during early autumn in the Southern Hemisphere, whereas
Voyage to the Planet of Prehistoric Women a small piece of it is mine", although in fact his adaptation of the "Planeta Bur" material had much more original material than the other, made by Curtis Harrington. His then-wife Polly Platt worked on the film as a production designer. In a retrospective on Soviet science fiction film, British director Alex Cox compared the movie to "Voyage to the Prehistoric Planet" and called "Voyage to the Planet of Prehistoric Women" "equally classic". Voyage to the Planet of Prehistoric Women Voyage to the Planet of Prehistoric Women is a 1968 American science fiction film, one of two which were adapted