The total eclipse of the sun which will occur in Mexico and southern California on September 10 next is attracting world-wide attention because it will afford another opportunity for verification of the deflection of starlight calculated by the theory of relativity. Expeditions from all over the world will set up observation posts in the path of the eclipse, which will cover a curved patch about 105 miles in length, from Santa Catalina Island, across Lower California, and the state of Sonora to Durango. The period of totality will last not more than...
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