Full Worm Moon Live Stream: Watch Last Supermoon of 2019, Spring Equinox, Live Online

A glowing supermoon is set to illuminate the sky this week, for the last time in 2019.

A full moon happens when the sun lights up the entire side of the moon facing our planet. This is called a "supermoon" when it is full and also in its perigee. That's where the celestial object is closest to the Earth in its elliptical orbit. This makes the moon appear a little bigger and brighter than normal to the naked eye.

The moon was at its perigee at 3:47 p.m. EDT on Tuesday. At that stage, it was 223,306 miles from Earth. The orb is expected to be most visible from our planet at 9:43 p.m. EDT on Wednesday.

Sky-gazers wanting to catch sight of the phenomenon can tune in to the live stream below, run by the Slooh robotic telescope service from 2 p.m. EDT (or 11 a.m. PDT and 6 p.m. UTC).

Courtesy of Slooh

The March full moon will also be the first of the vernal equinox, which marks the start of spring in the Northern Hemisphere and fall in the Southern Hemisphere. The equinox occurs around four hours before the full moon, according to AccuWeather.

The first moon of spring in the Northern Hemisphere is also known as the "worm" moon. It is believed to have earned its name after the sight of earthworms appearing in spring's moister and warmer soil, Space.com says.

Walter Freeman, an assistant teaching professor in the Physics Department at New York's Syracuse University, told Newsweek: "The best spots [to see the moon] are places where it is more likely to be clear, out West, in particular. The full moon is bright enough that it can overcome light pollution from city lights in all but the largest cities."

Virtual Telescope Project astronomer Gianluca Masi said the moon will appear 7 percent bigger and a bit brighter than an average full moon, but casual stargazers will not recognize this at first glance.

He continued: "This supermoon is somewhat special. Having the full moon so close to the vernal equinox is relatively rare. Last time, this happened 19 years ago, in 2000. Next time will be in 2030. But neither of them was or will be a supermoon. So the next full moon will be very special, offering once again a wonderful opportunity to stay out there and look up to the sky."

Freeman also offered some advice for those looking to take a snap of the event. "Moonlight is just reflected sunlight, so long-exposure landscape photographs shot at night lit by moonlight are remarkably eerie. You will see white puffy clouds and blue sky, just like you would during the daytime.

"However, you'll see stars in the middle of the blue sky if the moon isn't in the frame itself and you are in a clear location," he continued. "Moonlight is dim enough that it doesn't completely wash out the stars, unlike sunlight. So if you're out with a camera and a tripod during the full moon, try taking a moonlit landscape picture."

This week's supermoon will be the final one for 2019 and the third of the year. Supermoons also occurred on January 21 and February 19. The latter marked the closest supermoon, when the object was 221,733 miles away from Earth.

A pair of arguably less exciting new moon supermoons are set to happen on August 1 and 30, as well as September 28, according to EarthSky.com. But we won't be able to see them, because the side illuminated will, of course, be facing the sun.

Visit Slooh.com to snap and share your own photos from this live event, interact with our hosts and guests, and personally control Slooh's telescopes.

This article has been updated with a comment from Walter Freeman.