The Joys of Spring Learn some of the joys of spring like bird calls, chirping, astronomy, lunar activity, blossoms and violets. By Fred Schaaf Birds are one of the many joys of Spring. Kirtland's warbler nests in north- central Michigan. PHOTO: O.S. PETTINGILL/PHOTO RESEARCHERS, INC. April and May are the heart of spring. The mathematical halfway point of the season is May 6; this is the point when Earth is between the March equinox and the June solstice positions in its orbit. But of course where you are in the U.S., Canada, or elsewhere in the northern temperate latitudes of our world will affect when the weather, fauna, and flora around you tell you that spring has truly arrived. Spring is really even more complicated, of course. It comes and goes at first, like a bird looking for a nesting spot, until it decides to stay.