[Article] The variable sun Adjust Share By C.G. (Charles Greeley) Abbot, This article is only available as a PDF to subscribers. Download PDF Tags 20th century Astrophysics Bolometer C.G. (Charles Greeley) Abbot Mount Wilson Observatory (Calif.) Observations Plants, Effect of solar radiation on Research S.P. (Samuel Pierpont) Langley Smithsonian Astrophysical Observatory (Washington, D.C.) Sun More from C.G. (Charles Greeley) Abbot The heavens through a spectroscope Adjust Share Close < Previous Issue | View All Issues | Next Issue > July 1914 < Previous Issue | View All Issues | Next Issue > Table of Contents Close