Show y l S Sels s Centennial BOSTON Long Long known as the western hemispheres hemisphere's Patrolman of ot the Skies the Harvard college observatory ob will note the anni of its founding at a four day celebration December 2730 30 In connection connection con con- with the event two science conventions are scheduled here First planetarium in the world to photograph the stellar activities of the sky the observatory was completed com corn in 1846 Since then it has be be- come the he central clearing house for all astronomical information on this continent Beginning in 1880 the observatory tory has photographed huge sections of ot the sky each night As a result it has a collection of ot photograph plates numbering more than which which- enables astronomers astronomers' to check the stellar activities which have occurred oc during any clear evening of the past 66 |