Explorations and field-work of the Smithsonian Institution in .. . ations as satisfactory as our station in Chilewere available we might hope to overcome this obstacle. The outcomewe might then hope for would be a prediction of weather changes for aweek or 10 days in advance. Until values of solar variation of higheraccuracy than those as yet available can be obtained, we cannot testthis anticipation, or know whether it is exaggerated. In a paper given at the National Academy of Sciences meeting inCambridge on^November 20, 1933. the writer pointed out evidence ofa 23-year master cycle of perio
Explorations and field-work of the Smithsonian Institution in .. . ations as satisfactory as our station in Chilewere available we might hope to overcome this obstacle. The outcomewe might then hope for would be a prediction of weather changes for aweek or 10 days in advance. Until values of solar variation of higheraccuracy than those as yet available can be obtained, we cannot testthis anticipation, or know whether it is exaggerated. In a paper given at the National Academy of Sciences meeting inCambridge on^November 20, 1933. the writer pointed out evidence ofa 23-year master cycle of periodicity in a group of solar changes, towhich the weatherresponds in a manner to tend to repeat itself bothas to temperature and precipitation each 23 years. This seems topromise long-range forecasting of the approaching seasons and offuture years. The solar observations referred to above are not re-quired for it, but rather for the attempt to improve relatively short-range weather forecasting. Smithsonian Misc. Coll., vol. 85, no. i, 1931- SMITHSONIAN INSTITUTION. ^vr^
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