Last Updated: Lunar Eclipse 2021: What Is Super Flower Blood Moon? Everything You Need To Know “You may be able to observe first part of eclipse as the Moon just starts to darken, the Moon will be near or on the horizon," NASA said about Blood Moon 2021. IMAGE: NASA/ INSTAGRAM/@thewaywardpath The cosmic second supermoon of 2021 will rise next week on May 26 causing a total lunar eclipse. It would be the second of three supermoons witnessed this year. Also known as the “Full Flower Moon”, due to the springtime flowers in the Northern Hemisphere this time of the year, the moon will grace the night sky as Earth positions itself directly between the sun and the lunar body, blocking the moon from reflecting sunlight.