rhythm of marks by night
Lights that shine at night; their color and the frequency of their flashing signal various meanings, including the source of the light.
interval
Duration between two periods at which time the light remains dark.
interval
Duration between two periods at which time the light remains dark.
period
Duration between two intervals at which time the light signals.
period
Duration between two intervals at which time the light signals.
period
Duration between two intervals at which time the light signals.
light
The light’s color and brightness vary during the period as a function of the type of light.
darkness
No light.
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