Abstract
PERIODICITIES. AN annual periodicity was early suspected in my own observations in England. At the time of writing, observations lasting over five years are available, so far as the auroral component is concerned. To examine impartially whether or not an annual variation is present, the observations of each calendar month (say, November 1926) are averaged, and the mean is adopted as representative of that particular month, without further reference to the data for individual nights.
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RAYLEIGH, L. Some Recent Work on the Light of the Night Sky1. Nature 122, 351–353 (1928). https://doi.org/10.1038/122351a0
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DOI: https://doi.org/10.1038/122351a0