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. [Please select]
0
There were sunspots that summer. [Please select]
0
There was a lot of talk about those sunspots when we were in Lombard street west. [Please select]
Do you have a better example in your mind? Please submit your sentence!