Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 143
y aday or a week, moves from P, to P^. At another partof its orbit it moves from P to P^ in the same time,and at a third part from P^ to P,. Then the areasSP,P,, SPP,, SP,P, will all be equal. A littlegeometrical consideration will, in fact, make it clear thatthe areas of the triangles are equal… … Fig. 51.—law of abeas. In the time of Keplek the means of measuring thesuns angular diameter were so imperfect that the preced-ing method of determining the path of the earth aroundthe sun could not be applied. It was by a study of themotions of the planet Mars, as observed by Ttcho Brahe,that…
Astronomy
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