| sky(noun, heaven, firmament, welkin) |
| astronomy(noun, science, space, star) |
| atmosphere(noun, heaven, sky, firmament, welkin) |
| darkness(noun, time, dark, dim, night) |
| nighttime(noun, time, darkness, night, nightfall) |
| skylight(noun, light, sky, night) |
| nightfall(noun, time, darkness, night) |
| observation(noun, view, sky, starscape) |
| astrology(noun, science, space, star) |
| cosmology(noun, science, space, star) |
| view(noun, sky, observation, starscape) |
| air(noun, heaven, sky, firmament, welkin) |
| astrophysics(noun, science, space, star) |
| dimness(noun, time, darkness, night, nightfall) |
| firmament(noun, heaven, sky, welkin) |
| gloom(noun, time, darkness, night, nightfall) |
| heaven(noun, sky, firmament, welkin) |
| midnight(noun, time, darkness, night, nightfall) |
| uranology(noun, science, space, star) |
| welkin(noun, heaven, sky, firmament) |