As the Lyrid meteor showers flame through the late-night sky this week, a second shower overlaps: the Eta Aquarids, active from April 19 through May 28 and peaking on May 6. These are also seen late at night, after 11 p.m. The thin sliver of moon will not compete by glowing too brightly, so if skies are clear, you may see an average of 30 meteors an hour.

As May approaches, the roadsides are scattered…