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The following points should be carefully noted about these Nistograms: (a) ‘The negligible number of sightings when the sun is within 10* of the zenith and nadir (angle of elevation of the sun © £90*) of the observer is duc to the fact that the southern= most latitude of the U.S. is greater than the declination of the sun at the summer solstice, so that it would be im= possible for the sun to reach the zenith of nadir of any observer in the U. S. (where most of the sightings were made). (2) The...