Early mornings bring extreme low tides, with the lowest at -1.3 on Sunday, July 15 at 7:26 a.m. Dropping overhead are the Delta Aquarids from July 22 through August 23, peaking on July 28. It is a quiet shower, with about 20 falling stars an hour. Meteors are bits of rock, typically remnants left when a comet explodes. As the debris enters the earth’s atmosphere and speeds through the air, it generates heat and becomes…