What is Blood Moon ?
the phenomenon whereby the moon in total eclipse appears reddish in color as it is illuminated by sunlight filtered and refracted by the earth's atmosphere.
What does Blood Moon really mean in the Bible ?
In the book of Joel Blood Moon are part of the prophecies, originally serving the omen where it is written in Joel 2:31 "The sun shall be turned to darkness, and the moon to blood, before the great and awesome day of the LORD comes.