equatorial average; for the polar readings <7=0.62 and for the equatorial <7=0.91. This indicates less accuracy in performing the equatorial measures. Because of the identical average, the null hypothesis cannot be rejected. The interference from natural terrestrial atmospheric sodium emission was several magnitudes less [37, 38] and did not affect the experiment. The most serious potential interference were sodium vapor lights. Fortunately, the predominant night illumination of Cleveland is high pressure sodium lighting, which is broadly selfabsorbing in the region of the D lines. Had low pressure sodium illumination been used, which is recommended by astronomers concerned with light pollution, the detectors would have been swamped with artificial lighting emission and this particular experiment would have been impossible. Readings were also made with interference filters, at less sensitivity, centered around the hydrogen alpha line and H&K lines of calcium II. In these experiments, no significant difference was detected between the poles and equator. Figure 3 shows a photograph taken on 27 July 1988 of the northern polar region of the Moon that was sampled on 1 July with the photomultiplier arrangement. Earlier, test readings were made with Kent State University’s refractor on 31 May. The sensitivity was very low, and the purpose of the observations was to test the equipment, but in addition no significant differences were discerned between polar and equatorial readings. Additional Investigations: Preliminary Results On 28 July 1988, 36 spectrograms were made of the lunar poles and equatorial
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