Finally, somebody found the use for black sun effect in a productive way. MDPI publishes Sungkyunkwan University, Korea paper "Accurate and Cost-Effective Micro Sun Sensor based on CMOS Black Sun Effect" by Rashid Saleem and Sukhan Lee.
"An accurate and cost-effective micro sun sensor based on the extraction of the sun vector using a phenomenon called the “black sun” is presented. Unlike conventional image-based sun sensors where there is difficulty in accurately detecting the sun center, the black sun effect allows the sun center to be accurately extracted even with the sun image appearing irregular and noisy due to glare. This allows the proposed micro sun sensor to achieve high accuracy even when a 1 mm × 1 mm CMOS image sensor with a resolution of 250 × 250 pixels is used."
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