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https://www.endtime.com/four-blood-moons/The occurrence of blood moons is quite common, normally happening at least twice per year. Most of us have seen the moon when its appearance has changed to red. When four blood moons happen in close succession, NASA refers to this as a tetrad. Tetrads are rather rare, only taking place fifty-five times since 1 AD. The Teaching of the 4 Blood Moons