Word: polarity
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...height, gives 3.1416, the geometrical π. The number of of days in the year is deducible from the dimensions of an inner chamber. One of the interior galleries is oriented toward the pole star. The pyramidal cubit (635.66 millimeters) is exactly one ten-millionth of the earth's polar radius. Cheops is oriented to within five minutes of arc to modern latitude and longitude. Its meridian divides the Delta of the Nile and the habitable continents into two equal parts...
Penaranda Barca of the Spanish Balloon Polar...
Injured seriously. Gomez Guillamon, assistant to Barca in the Polar...
Donald B. MacMillan, the American explorer, who has occupied the center of the Polar stage since the failure of Capt. Roald Amundsen's expedition (TIME, June 18, June 25), has been heard from after a long silence...
...called lakes which had almost disappeared, have become unusually dark lately. New canals have appeared and others have changed color or broadened. But they do not show the vast, complicated network which Professor Lowell thought he observed there. The most distinctive features of the Martian topography are the polar snowcaps, brilliant white patches at the respective poles, which expand in the Martian winter and diminish in summer, just as the arctic regions on the earth. The color changes in the canals and spots are also seasonal, and very suggestive of vegetation. These and other observations have led to the irresistible...