Annals of the Astrophysical Observatory of the Smithsonian Institution (1900)
Washington : Government printing office · leaf 148
118 ANNALS OF THE ASTROPHYSICAL OBSERVATORY. solar-constant observations alone do not enable us to decide. This question might perhaps be settled by photometric comparisons of the planets with the stars, but considerable difficulties may be expected to attend such a research. Results to be … MAV JUNE f JULY AU6. SEPT OCT. 20 30 9 19 29 9 19 29 8 18 2.B 7 17 27 7 17 27 given below, and others in Chapter VII, seem to confirm the belief that the variation is really in the sun and not caused by the obstruction of solar rays by meteoric matter.
Infrared spectra · Solar radiation
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