Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 170
Surface,—The sunssurface is a hundred and ninety thousand times as bright asa candle-flame, a hundred and forty-six times as bright asthe calcium-light, and about three times and a half as brightas the voltaic arc. The suns disk is much less bright near the margin thannear the centre, a point on… … Fig. 162. 152 ASTRONOMY. atmosphere as we pass from the centre towards the marginof the suns disk; and this increased absorption is due tothe fact, that the rays which reach us from near the marginhave to traverse a much greater thickness of the solaratmosphere than those which reach us from the…
Astronomy
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