The first day of Spring and the last supermoon for 2019 will both take place on Wednesday, March 20.
The Spring equinox, also called the vernal equinox, will occur at 5:58 pm EDT. The supermoon occurs at 9:43 p.m. EDT. The last time both occurred on the same date was on March 20, 1981, according to The Old Farmer's Almanac.
The first full moon of March is called the Worm Moon. The moon will also appear full tonight, according to Space.com. Supermoons don't look bigger to the eye but they do look significantly brighter, according to earthsky.org
For those looking ahead in the year, the Fall Equinox 2019 is on Monday, September 23, 2019.