The Distribution of Blue-Violet Light in the Solar Corona on August 30, 1905, as Derived from Photographs Taken at Kalaa-es-Senam, Tunisia . first and last photographs; it equals the angle VQI,. CCVII.—A, 2 s 314 PROFESSOR L. BECKER ON THE DISTRIBUTION OF subtended by BA at M. The position angle, counted from the north pole of the sun,of the second contact is 104 degrees. CMS is designated by a, A measured distance m, at position-angle P, is reduced to distance h from the sunslimb by the following formula, small quantities being neglected, tan a 7^) tan 78°-3, h = w +0*0125103/ !_52178^3 cos /
The Distribution of Blue-Violet Light in the Solar Corona on August 30, 1905, as Derived from Photographs Taken at Kalaa-es-Senam, Tunisia . first and last photographs; it equals the angle VQI,. CCVII.—A, 2 s 314 PROFESSOR L. BECKER ON THE DISTRIBUTION OF subtended by BA at M. The position angle, counted from the north pole of the sun,of the second contact is 104 degrees. CMS is designated by a, A measured distance m, at position-angle P, is reduced to distance h from the sunslimb by the following formula, small quantities being neglected, tan a 7^) tan 78°-3, h = w +0*0125103/ !_52178^3 cos /p + a^i04_78) cos a The maximum of h—m is 0*025 inch. The correction of the position-angles isinappreciable for our purpose. (c) Curves of Equal Intensity of the Corona-—I define the mean distance of anequal-intensity curve of the corona as the mean of the distances of twenty-four pointsof the curve, 15 degrees apart. Equal-blackness curves coincide with equal-intensitycurves on Photographs VIII. and IX,, and also on Photograph I. The measureddistances were first corrected for corrections (a) and (6), and then each twenty-fourphiltrans01200638. 7
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