Berry, Arthur,b. 1862 · London, J. Murray · leaf 495
ing the number the logarithm of whichis -4, so that (2-512...)5/2 = 10. t If L be the ratio of the light received from a star to that receivedfrom a standard first magnitude star, such as Aldebaran or Altair,then its magnitude m is given by the formulam - 1L = 1 ) = ( ) , whence m — I = log L. A… … Fig. 104.- -The Milky Way near the cluster in Perseus,by Professor Barnard. From a photograph{To face p. 405. $ 317] Photometry: the Sidereal Systein 405 317. The great problem to which Herschel gave somuch attention, that of the general arrangement of thestars and the structure of the system, if…
Astronomy
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