The Sunday evening eclipse is the last in a "tetrad" -- a term for four total lunar eclipses happening at six-month intervals -- that has been stunning skywatchers across the United States for the past 18 months,
The Sunday evening eclipse is the last in a "tetrad" -- a term for four total lunar eclipses happening at six-month intervals -- that has been stunning skywatchers across the United States for the past 18 months,
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