Example of the calculation of meteoroid probabilities to be associated with an active stream. Red thick crosses denote the lunar area where the stream meteoroids are expected to impact Moon during the night of 14 December 2017 (Geminids maximum). Yellow star is the sub-radiant point of the Geminids stream on the Moon, while green crosses and circles represent the detected validated and suspected flashes, respectively, between 11 and 14 December 2017.