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Lights that shine at night; their color and the frequency of their flashing signal various meanings, including the source of the light.

See rhythm of marks by night in : french | spanish

Duration between two periods at which time the light remains dark.

Duration between two periods at which time the light remains dark.

Duration between two intervals at which time the light signals.

Duration between two intervals at which time the light signals.

Duration between two intervals at which time the light signals.

The light’s color and brightness vary during the period as a function of the type of light.

No light.