Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 145
say aday or a week, moves from P^ to ^3. 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 areas. In the time of Kepleb 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 Beahe,that…
Astronomy
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
