Goes back to at least 1900: https://books.google.com/ngrams/graph?content=blood+moon&year_start=1800&year_end=2022&corpus=en&smoothing=3 https://books.google.co

Goes back to at least 1900: https://books.google.com/ngrams/graph?content=blood+moon&year_start=1800&year_end=2022&corpus=en&smoothing=3 https://books.google.com/ngrams/graph?content=blood+moon&yea...