OCR Text |
Show Energy From tlie Sun Varies Slightly From Day to Day The amount of energy received from the sun, or what is known as the solar constant, has been found to vary slightly from day to day. It may be either nbove or below average aver-age for months at a time. By observations obser-vations and calculations extending over many years, Doctor Abbot of the Smithsonian institution has discovered dis-covered the existence of seven periodicities peri-odicities of 7, 8, 11, 21, 2.", 4,r) nnd GS month periods. Washington Star. |