Annals of the Astrophysical Observatory of the Smithsonian Institution (1900)
Washington : Government printing office · leaf 292
254 ANNALS OF THE ASTRO PHYSICAL OBSERVATORY We show these results in Figure 27. Obviously the 12-month period breaks down completely. The first five years are nearly opposite to the last five years, and the ten-year averages show no continuity of march at all, and an extreme range of only 0.2 per… … regards variation, the first six cycles agree closely with the last five cycles, and with the general mean of 11 cycles. A range of 0.37 per cent is definitely shown. The minimum occurred from June to August in the year 1921, and at eleven-month inter¬ vals regularly thereafter, so that June to…
Infrared spectra · Solar radiation
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
