. The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific. t to arise partly from sunlight by akind of dust-fog around the Sun, and partly from a hypo-thetical element, coronium, giving the characteristic green raythat corresponds to nothing known in the Sun or upon theEarth. This lends the corona a peculiar interest and togetherwith the uncertainties concerning its nature and relationshipto the Sun must for a long time give it prominence in theprogram of eclipse observations. Numerous
. The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific. t to arise partly from sunlight by akind of dust-fog around the Sun, and partly from a hypo-thetical element, coronium, giving the characteristic green raythat corresponds to nothing known in the Sun or upon theEarth. This lends the corona a peculiar interest and togetherwith the uncertainties concerning its nature and relationshipto the Sun must for a long time give it prominence in theprogram of eclipse observations. Numerous efforts have been made to discover connectionsbetween changes in the Sun and terrestrial phenomena. Sun-spots, faculae, and prominences increase together to a maxi-mum number, decrease to a minimum, then rise again to amaximum in regular sequence, that is, they show a definiteperiodicity. The question may be raised, Are there phenomenaon the Earth that run the same periodic courses? If ter-restrial changes manifest the same orderly sequence over along period of years we would be justified in assuming aconnection between the solar and such terrestrial (a) Doubling of lines in the magnetic field. (b) Doubling of line in the umbra of a sun-spot.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectastronomy, bookyear19
