Smithsonian Report, 1958.—Suess PeAsiea2 
wees 4. ee ee 
1. The 200-inch Hale telescope pointing north. 
2. Two spectra (a and b) of the constant-velocity star Arcturus taken about 6 months 
apart clearly show the Doppler shift caused by the earth’s orbital velocity of 50 km./sec. 
Pp PFE ) } 
