Summer solstice arrives on Tuesday, June 20, with the North Pole reaching its northernmost position. The new moon follows on June 23; seven-foot high tides will occur between 10 and 11 p.m. from June 22 to 25, with corresponding very low tides—negative 1.6—around sunrise.

Swallowtail butterflies—large and light yellow with black-rimmed wings and stripes—have been flitting among the spikes of flowering buckeyes. An easy way to tell a butterfly from a moth: butterflies rest with…