Show r r SUNS SUN'S SUN S HEAT TO BE OUR BAROMETER Weather Forecasts Will Be Possible Months Ahr Ab ad TESTS WILL TAKE YEARS t Professor Frost Director of Yerkes Observatory Predicts That Future Scientists Will Be Able to Tell tho the Temperature Six Months In Advance Ad Ad- vance Observe vance Observe Sun Spots s r Great Interest Is manifested among f scIentists as the result of ot a published statement of Professor Edwin B. B Frost director of ot the Yerkes observatory to the effect that it has been determined that the solar constant Is Ls In fact a variable quantity and that the effect r of the change Is not not- appreciable on onearth onearth earth until as long as six sU months after the change For this reason Professor frost Krost Is W of tho opinion that eventually It may ber bew be bo w r V possible to determine general weather conditions that far ahead ahead In In other words that careful observations of ot solar so so- Jar lar conditions will Indicate what conditions conditions con con- I may prevail on the earth later In addition to the tho observations made by Professor Frost similar observations observations I. I have been made by Professor H. H n. n Kimball for the government at the station on Mount Weather In his statement Professor Frost declares de de- Glares clares that careful observations Indicate unit Indi cate Gate that the late Professor Protessor S. S P. P Langley Lang Lang- ley Jey placed his estimate for the amoun amount of heat hent absorption by the earth at too high a figure Professor Langley Langley's Devices Professor Frost In his statement comments on 00 the Ingenious devices Ina in invented In- In a vented by Professor ProCessor Langley by which 1 V he be measured the suns sun's hat and on the I discoveries of ot C. C G. G and F. F B. B Fo Fowle who for tin the past ten hn years t ars have been their Investigations a at t sea ea I level vel mill and ni III l 1 wt Whitney Whit ney feet ct tool ami lt IO Wilson lIson feet leU In southern California He ne V. V goes on to say i V The must most striking result of f r these Investigation In IH is the b Abbott Abbott Ab Ab- pr by j bott and Fowle that the olar constant con p stant Is not a n constant but a variable In in other words that our sun Is a n at t variable star like hundreds and md thoua thousands thou thou- a g sands of ot others In ln the sky t It flit was nearly t ten fen n years ears ago that these Investigators found evidence that the radiation of the sun was not steady from day to day and ten teo years of ot work has bas been devoted to determining whether r these apparent variations i 1 were really in the sun or due to errors errors errors er er- of ot observation or to fluctuation In Inthe Inthe the absorption by by the earths earth's atmo atmo- k sphere They now feel reel Justified in instating stating that tb these p fluctuations are real realand reals s and are arc in 10 the sun itself amounting I Ito Vt to 5 per rent ent or more in a n period of ot a u week or ten days V Observations for tor sun sun spots spot have c now been made long enough so that t twe we know that they are more numerous rV every eleven years slowly declining from a maximum number to a mini mint minImum minimum mum number about seven years later and then rising again to a maximum about tour four Cur years after atter the minimum Importance of the Discovery f s 's The Importance of this discovery of ot the variation lu in the suns sun's beat bt is probably probably prof ably obvious to the render The in inhabitants In- In habitants of or are entirely de dl dependent pendent for their existence upon the results of agricultural work Rork lIrk and nothing noth ing I is more mort than that the radiation ra ra- V rom front the sun lies at the basis of the principal weather elements In r the atmosphere V It should not be Inferred that a fix sudden n startling change hause An In the suns sun's radiation produces an un immediate tp effect in 10 the tt terrestrial temperatures The earths earth's atmosphere takes up lip these V V chan changes and gradually communicates f them to the earths earth's surface How soon fand and to what degree remain to be In In- r ted t study extended perhaps per V haps over I many years lm will be required i to determine If It these changes in ra radiation rat- rat can cnn be tw predicted in advance and aud if It the laws laWM an ran be determined iV F which govern rn them It Is evidently a most practical problem touching the ti VV Interests of ot every Inhabitant of ot the a. a earth j |