Two days later, the ship conducted a two-hour night tactical exercise on a dark, moonless night, commencing at 20:00.
The night was moonless, and after dark a thunderstorm came up.
The prisoners had to wait about a week for a moonless night so that they could leave under the cover of complete darkness.
Some navigators mount a light-amplifying monocular to help see the horizon on moonless nights.
All the re-entry firings took place on clear moonless nights, so that the luminous wake of the re-entry body could be observed photographically.
In a 2009 laboratory study, horses were able to distinguish different shapes in low light, including levels mimicking dark, moonless nights in wooded areas.
The fluorescence detectors are used to track the particle air shower's glow on cloudless moonless nights, as it descends through the atmosphere.
They are nocturnal at the colonial breeding sites, preferring moonless nights to minimise predation.
