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This Day in World History - Why does most every country in the world agree on how to determine what time it is? You can thank the International Prime Meridian Conference, which began on October 13, 1884, and lasted nearly ten days. The twenty-five countries that gathered in Washington , D.C., agreed to accept the line of longitude that passed through Britain’s Royal Observatory as the prime meridian—the line of 0° longitude (just as the Equator is 0° latitude). The nations also agreed that the time at Greenwich would be the standard time against which all other times would be compared—Greenwich Mean Time.
This Day in World History - Sometime around September 23 each year, Earth reaches the autumnal equinox, the point when the sun stands directly above the Equator and daylight and dark are roughly equal. (The day, of course, marks the autumnal equinox in the Northern Hemisphere. South of the Equator, it is the vernal, or spring, equinox. March 23 is the spring equinox in the Northern Hemisphere and the autumnal equinox in the Southern.) These astronomical events did not go unnoticed by ancient peoples.
