Description: EARTH DAY draws on astronomical phenomena in a new way ¨C which is also the most ancient way ¨C using the vernal Equinox, the time when the Sun crosses the equator making night and day of equal length in all parts of the Earth. To this point in the annual calendar, EARTH DAY attaches no local or divisive set of symbols, no statement of the truth or superiority of one way of life over another. But the selection of the March Equinox makes planetary observance of a shared event possible, and a flag which shows the Earth as seen from space appropriate.