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Published online by Cambridge University Press: 15 September 2014
In several papers by Chapman (1918, p. 271; 1919, p. 113, etc.) the effect of the moon on the atmospheric pressure has been analysed; the chief inequality observed is semi-diurnal, being, for example, 0·0120 sin (2θ + 114°) millibar at Greenwich, 0·083 sin (2θ + 68°) millibar at Batavia, and 0·060 sin (2θ + 60°) millibar at Hongkong; θ being measured from upper lunar transit.