Astrophysics.- Hale (George E.) "Preliminary Note on the Rotation

Astrophysics.- Hale (George E.) "Preliminary Note on the Rotation of the Sun as Determined from the Motions of the Hydrogen Flocculi", in The Astrophysical Journal, vol.27 pp.219-229, 3 plates, chipping with loss to backstrip, joints split, some wear, Chicago, 1908 § Schuster (Arthur) "Radiation Through A Foggy Atmosphere", in The Astrophyscial Journal, vol.21, pp.1-22, light marginal browning, Chicago, 1905, ex-library copies with ink-stamps, library half calf, spines darkened, library paper label and tape to spines and covers, rubbed, extremities worn; and another, physics, 8vo (3) *** George Ellery Hale uses the motion of hydrogen flocculi to measure the sun's rotation, introducing a dynamic and observationally grounded approach to solar behaviour. Schuster formulates for a radiative transfer problem applied to stellar atmospheres, aiming to explain the origin of absorption and emission lines in stellar spectra. He demonstrates that light undergoes multiple scattering, which alters its observable properties.

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