North Americans are about to experience a "tetrad" of lunar eclipses. Starting April 15th, the continent will be witness to a series of four consecutive total lunar eclipses occurring at approximately six month intervals. This is a fairly rare phenomenon as eclipses tend occur about twice each year.

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DISCUSSION

plasticnudemartini
plasticnudemartini

4 at 6 month intervals is more rare than twice a year?

I don't understand this "new" math.