ASTRO465 Lecture Notes - Lecture 1: Alibaba Group, Online Public Access Catalog, Mechanical Equilibrium
18 Sep 2016
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For this purpose a legitimate approximation is not just an unavoidable evil; it is a discernment that certain factors-certain complications of the problem-do not contribute appreciably to the result. We satisfy ourselves that they may be left aside; and the mechanism stands out more clearly, freed from these irrele- vancies. The correct use of this insight, whether before or after the mathematical problem has been for- mulated, is a faculty to be cultivated, not a vicious propensity to be hidden from the public eye. Needless to say the physicist must if challenged be prepared to defend the use of his discernment; but unless the defence involves some subtle point of dif culty it may well be left until the challenge is made. a i. Sir arthur s. eddington: the internal constitution of the stars , 1926. Mass-luminosity relation (halm 1911, russell 1913, hertzsprung 1918) Connection mass-luminosity + temperature-luminosity evolution (russell 1914)
