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James A. Van Allen lab journal, September 1959-January 1961
Page 62
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At 0830 C.S.T., I measured [sketch/picture] drawing includes eye, 56 cm, 55 cm, lambda, etc. arc tangent (27.5/56) = arc tangent 0.49 ~= 26 degrees +- 5 [minutes? degrees?] to center angle from sun to upper arc was ~ 2 [times] as great or about 50 degrees . Very rough!
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At 0830 C.S.T., I measured [sketch/picture] drawing includes eye, 56 cm, 55 cm, lambda, etc. arc tangent (27.5/56) = arc tangent 0.49 ~= 26 degrees +- 5 [minutes? degrees?] to center angle from sun to upper arc was ~ 2 [times] as great or about 50 degrees . Very rough!
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