NO. 7 ASTROPHYSICAL OBSERVATORY, I904-I953 — ABBOT 1 5 



with observation from 1950 to 1963 of about +42 percent. Unfor- 

 tunately displacements of obviously similar features made this cor- 

 relation coefficient fully 10 percent lower than those for most U.S. 

 stations. Rectifying these obvious displacements, I found a correla- 

 tion coefficient of +72 percent for Woodstock. 



Figures 2, 3, and 4 of the present paper, and figures 18, 19, 20, 

 21, 22, 23, 24, and 25 of Pub. 4545,^ and many examples I have en- 

 countered in forecasts of precipitation for 54 cities show how over 

 30 regular periods, harmonics of 273 months, are "hidden" if one 

 regards meteorological time as if it were a river running serenely 

 forever in a smooth uniformly inclined channel. All researchers do 

 so who neglect time of the year, sunspot activity, and march of popu- 

 lation, all affecting atmospheric transparency, and neglect the super- 

 position of short-period harmonics confusing longer ones. 



CLASSIFIED REFERENCES FROM SMITHSONIAN PUBLICATIONS 



A. Accuracy of the solar constant as measured. 



(1) Annals, A.P.O., vol. 6, p. 163. Published 1942. 



(2) Smith. Misc. Coll., vol. 134, No. 1, Pub. 4265, p. 2. Published 1956. 



(3) Smith. Misc. Coll., vol. 146, No. 3, Pub. 4545, table 1, pp. 10-15. Pub- 

 lished 1963. 



B. "Hidden" periodicities. 



In solar constant measures: 



(1) Smith. Misc. Coll., vol. 117, No. 10, Pub. 4088. Published in 1952. 



(2) Smith. Misc. Coll., vol. 128, No. 4, Pub. 4213, pp. 4 and 6, table 1, fig. 1, 

 and pp. 9 and 10, fig. 2. Published 1955. 



In weather: 



(2) Smith. Misc. Coll., vol. 117, No. 16, pp. 11-18, 5 tables, 8 figs., Pub. 4095. 

 Published 1952. 



(3) Smith. Misc. Coll., vol. 121, No. 5, pp. 2-5, table 1, fig. 1, Pub. 4103. Pub- 

 lished 1953. 



(4) Smith. Misc. Coll., vol. 128, No. 3, pp. 1, 2, Pub. 4211. Published 1955. 



(5) Present paper. Number 10 "Harmonic periods and long-range forecasts." 



C. Weather forecasts do not require solar observations. 



Their independence from all solar measures except Wolf niunbers. ^ 20. 

 (1) Smith. Misc. Coll., vol. 121, No. 5, line 22, p. 2; line 15, p. 11, Pub. 4103. 

 Published 1953. 



D. High positive correlation with events. 



(1) Smith. Misc. Coll. vol. 128, No. 3, pp. +5, Pub. 4211. Published 1955. 



(2) Smith. Misc. Coll., vol. 139, No. 9, p. 1, Pub. 4390. Published 1960. 



(3) Smith. Misc. Coll., vol. 146, No. 3, pp. 60, 63, 64, Pub. 4545. Published 

 1963. 



(4) Smith. Misc. Coll., vol. 143, No. 5, p. 5, fig. 4, Pub. 4471. Published 1961. 

 I have (unpublished) the correlation coefficient between back-cast and obser- 



