Abstract
The accompanying International Geophysical Calendar 1961 designates some special days and intervals for special attention for geophysical experiments and analysis. The Calendar serves to encourage world-wide coordination of observation or analysis of those geophysical phenoemna which vary significantly during the course of a year. These phenomena are mainly in the scientific disciplines dealing with the earth's atmosphere. In some experiments, such as the routine measuring of variations of the earth's magnetic field, the observing and analysis programs at observatories are carried out at a uniform level throughout the year, and for these the Calendar is not needed.
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