"When this happens, the only light that reaches the moon's surface is from the edges of the Earth's atmosphere. The air molecules from Earth's atmosphere scatter out most of the blue light. The remaining light reflects onto the moon's surface with a red glow, making the moon appear red in the night sky," the agency explained on its website.
Notably, this Blood Moon is a combination of May's full Flower Moon – which is classified as a supermoon – and a total lunar eclipse.
A full moon is seen framed with a U.S. flag during totality of a total lunar eclipse as the moon enters Earth's shadow for a "Super Blood Moon" on May 26, 2021 in Chico, California. (Photo by PATRICK T. FALLON/AFP via Getty Images)
A supermoon, also known as a perigean full moon, occurs when the side of the moon facing Earth is fully illuminated by the sun and is at the closest point in its orbit around Earth.
While the super Blood Moon and its total eclipse phase is distinctly visible over eastern Asia, the Pacific Ocean and parts of the western U.S., most of the East Coast and central U.S. gets the short end of the stick as the moon is below the horizon at the time of the full eclipse.
In a Monday blog post, NASA's Gordon Johnston said that explained that while East Coast viewers would only witness the "barely-detectable start of the eclipse as the moon sets," Americans lucky enough to have both clear skies and a clear view of the horizon would be able to really understand their place in the alignment.
"You can see the sunrise, then turn 180 degrees to see the curved shadow of the round Earth starting to fall across the edge of the moon as the moon sets," he instructed.
The supermoon would pass through the full shadow of the Earth – also known as the umbra – at approximately 5:45 a.m. ET.
The totality of the Blood Moon lunar eclipse would last for around 14 minutes and 30 seconds and the moon.
Following the eclipse, the event repeats in reverse as the moon moves out of Earth's shadow.
According to Johnston, the next full moon would appear opposite the sun in Earth-based longitude at 7:14 a.m. ET.
The moon is expected to appear full through Thursday morning.
A full blood moon is seen during a partial eclipse in Taipei on May 26, 2021 as stargazers across the Pacific are casting their eyes skyward to witness a rare "Super Blood Moon." (Photo by SAM YEH/AFP via Getty Images)
Forbes explained that the name Flower Moon indicates that just nine hours before becoming fully illuminated, the moon will reach its closest point to the Earth – or perigee – for the year.
The Flower Moon is named after the abundance of flowers that emerges in late spring.
However, the next total lunar eclipse won’t happen over North America until May 2022.