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UKTetrad
/tˈɛtɹad/
/tˈɛtɹæd/
Examples
1. Tetrads are four successive FULL eclipses with no partial eclipses in between.
2. So, what is the dark tetrad?
3. That's called the tetrad.
4. The 21st is going to have 85 eclipses and 8 tetrads!
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