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Published online by Cambridge University Press: 14 August 2015
We know the Leonid shower primarily from its record of visual appearances over the last millenium. The period of the stream and its status as a cosmic phenomenon are all intimately linked to historical visual observations of the stream. The advent of modern observational techniques in meteor astronomy such as radar and photography has not decreased the value of visual recordings of the stream; on the contrary, visual observations form our primary means of long-term monitoring of the shower.