Contents

18 June 1976
Vol 192, Issue 4245

About The Cover

Danish astronomer Olaus R&oumlaut;mer sweeps the sky with a meridian telescope in 1689, in the middle of a 70-year span of anomalous solar behavior. See page 1189. [From Peder Horrebow, Basis Astronomiae, 1735; permission of the Houghton Library, Harvard University, Cambridge, Massachusetts]