The Final Supermoon of the Year Occurs as an Asteroid Zips Close By

The Final Supermoon of the Year Occurs as an Asteroid Zips Close By
The "Supermoon" rises over the Rio de la Plata as seen from Buenos Aires on Feb. 19, 2019. Alejandro Pagni/AFP/Getty Images
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The third and final supermoon of the year will light up the sky on March 20, closing out a trifecta of supermoons for 2019 that began in January.

March’s full moon also happens on the same day as the spring equinox, welcoming in the season. The last time these two things happened on the same day was March 1981.