Clipped From Chicago Tribune
Earth Shadow Will Blot Out Moon Tonight (Diagrams on Page 5.) Unless clouds overhang the city tonight, tonight, Chlcagoans may see a total eclipse of the moon, the first visible here since 1028 and the last that will occur until 1938. The moon will first touch the shadow of the earth at 10:11 p. m., daylight saving time, and the total phase will be reachd at 11:09 and will last until 12:50 a. m. It will be almost two hours later when the orb escapes the shadow and the penumbra and resumes resumes its full brilliance. In a cloudless sky the moon will not be Invisible at any time. When its edge first passes -into -into the deep shadow that edge will appear black, but as totality Is reached the moon will appear as a coppery ball. Weather on Edges ot Earth. Scientists explain that the degree of illumination during the total eclipse will depend on weather conditions in Russia, South Africa, and Hawaii, sec tions which at the time of the lunar eclipse will be having either sun rise or sunset. In these regions the rays of the sun particularly the red ones will be bent by passage through the earth's atmosphere sufficiently to strike the otherwise fully shadowed moon. If these regions are clouded the rays will, in large part be shut off. A clear Hawaiian sunset, a fine Rus sian dawn, will Increase the light on the dead surface of the moon. Astronomers pay slight attention to lunar eclipses, which have been sub jected to intensive study in the past. It i3 known that when the phenome non occurs the surface of the moon. lacking atmosphere, becomes terrifical ly cold, nearly as cold as interstellar space, and warms up again when the sun shines again upon its surface. Hope to Analyze Light. At the Lowell observatory at Flag staff, Ariz., observers will make tests designed to analyze the little light reflected from the coppery moon face as It is bathed by the refracted red rays. The eclipse will be visible all over the United States and in South America, eastern Africa, and part of eastern Europe. All that the eclipse amounts to, vis ually, is that the moon gets into the earth's shadow for a little while. To a roan on the moon the event would be an eclipse of the sun. At the Adler planetarium Prof. Philip Fox will give an extra lecture at 3 p. m. explaining for the layman what will happen. Those who attend may view the real eclipse from the planetarium terrace. Regular pre views will he given at 11 a. m. and 3 p. m.