The brightest, biggest moon of the year will grace an evening that offers lots to celebrate, including the midpoint of spring and Cinco de Mayo. The only downside may be that the supermoon will make earth-grazing fireballs from the Aquarid meteor shower harder to see.
The confluence of a “supermoon,” the midpoint of spring, a meteor rain, and celebration of Cinco de Mayo will likely make Saturday night memorable for many Americans, especially star-gazers, revelers, and romantics.
The so-called “supermoon,” where a full moon coincides with the stellar body’s perigee, or closest point to earth, is one of the year’s astronomical highlights. While the actual full moon will occur at 11:35, followed by the perigee 25 minutes later, the time to take a look outside is actually around moon rise, which will occur around 7:30 EST. That’s when the moon will appear impossibly large as a result of a little known phenomenon where the celestial body is magnified near the horizon.
Astrologer Richard Nolle, who coined the term “supermoon” in 1979, has described the phenomenon as “a new or full moon which occurs with the Moon at or near its closest approach to Earth in a given orbit. In short, Earth, Moon and Sun are all in a line, with Moon in its nearest approach to Earth.” Scientists have sniffed at the breezy term, preferring instead the snoozier perigee-syzygy.
A few hours after the moon squeezes close at a distance of only 221,802 miles, astronomers are expecting the tailings from Halley’s comet, known as the Aquarid meteor shower, to rain down, though the bright moon may make the lightning fast sky-streaks harder to see. At its pre-dawn high point, the Aquarid could be shooting 60 to 70 meteors an hour into the earth’s atmosphere, including some “earth-grazers,” or meteors that streak across the sky, parallel to the horizon.