Don’t think so.
NASA lists per century how many tetrads occurred in that century.
If two tetrads occurred between 1700 and 1800 then two tetrads occurred in that century.
I don’t care if each tetrad lasts 25 years.
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Don’t think so.
NASA lists per century how many tetrads occurred in that century.
If two tetrads occurred between 1700 and 1800 then two tetrads occurred in that century.
I don’t care if each tetrad lasts 25 years.