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A Tetrad of Lunar Eclipses - NASA Science"During the 21st century, there are 8 sets of tetrads, so I would describe tetrads as a frequent occurrence in the current pattern of lunar eclipses," says Espenak. "But this has not always been the case. During the three hundred year interval from 1600 to 1900, for instance, there were no tetrads at all."
Some have claimed these tetrad cycles are rare, and they claim NASA as a source for such assertions. Once they "establish" this "fact", they then assert the "rarity" as a sign of significance in relation to future Bible prophecy. From that point they then give many theories concerning what is to come regarding Israel, and other issues related to Bible prophecy.
Unfortunately for our friendly rare tetrad based prophetic speculators, the very premise of all of their speculating is false.
Tetrads are not rare.