See the first supermoon on the spring equinox in 19 years
Look up while it lasts: This particular cosmic coincidence won't come again until 2030.
Assuming spring showers stay at bay, sky-watchers in the Northern Hemisphere will get to see a cosmic triple play on March 20, as a “super worm moon” lights up the vernal equinox. According to astronomy website EarthSky.org, a full moon has not landed this close to the first day of spring since the year 2000, and the two celestial events won’t happen less than a day apart again until 2030.
Because the moon’s orbit is egg-shaped, there are times when it is at what astronomers call perigee, or its shortest distance from Earth, and times when it is at apogee, or its farthest distance from Earth. And because the size of the moon's orbit varies slightly with each
