Sentence Examples

  • He initiated in 1866 the spectroscopic observation of sunspots; applied Doppler's principle in 1869 to determine the radial velocities of the chromospheric gases; and successfully investigated the chemistry of the sun from 1872 onward.
  • It is necessary to suppose, if the analogy is to hold, that the sun is brightest when sunspots and faculae are most numerous; this is by no means unlikely.
  • They also show less extensive bright flocculi, usually in the immediate neighbourhood of sunspots, and frequently eruptive in character.