A black-sun event occurs when a corrupted forecast or printed record causes Nullhaven's daylight signal to display a dark circular sun.
Characteristics
The event begins with incorrect clocks, blank newspapers, or forecasts describing a sunrise that has not occurred. A dark disk may then replace the ordinary sun in windows and public screens.
Effects
Long exposure can interrupt names, memories, and recognizable features. Affected readers may appear as silent silhouettes until the correct record is restored.
Prevention
Current guidance recommends stopping corrupted printing systems, preserving handwritten observations, and broadcasting a verified warning before the predicted sunrise time.