Show the saws notation rotation period professor duner the swedish astronomer has made known an important work which has led to surprising results concerning the rapidity of the suns revolution by observing the displacement of the lines of the solar spectrum in the observatory in potsdam professor duner has flag obtained a hitherto unknown exactitude in the measurement of the movements of the sun and found that the body moves around its axis at a rate of a mile and feet in a second of time the suns day lasts therefore at its equator twenty five da days ys and twelve hours of our reckoning iut but what Is remarkable in Duri diners ers u measure ments is that they result in a different length of revolution in different parts part of the body of the sun regularly increasing in length from the equator to the poles so that those parts of the suns surface lying near the two poles have a day as long a as forty forti six of our day lays this is only possible with a movable and gaseous body like that of the sun london news |