| Evening event |
| Horizon sight |
| Nighttime view |
| Celestial event |
| Lunar phenomenon |
| Horizon happening |
| Regular lunar event |
| Lunar disappearance |
| Luna's disappearance |
| When the Night darkens |
| Astronomical phenomenon |
| Nautical almanac listing |
| When satellite goes down |
| Neil Armstrong et al., in a way |
| Time when a satellite goes down |
| Luna's descent below the horizon |
| Nighttime astronomical phenomenon |
| Nighttime event in the western sky |
| When it occurs depends on latitude |
| Generally ignored astronomical occurrence |