International Geophysical Year

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International Geophysical Year

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By international agreement, a period during which greatly increased observation of worldwide geophysical phenomena is undertaken through the cooperative effort of participating nations. July 1957 to December 1958 was the first such year; however, precedent was set by the International Polar Years of 1882 and 1932. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use