A rare Christmas full moon
Chess Daily News from Susan Polgar
Full moon Christmas
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A rare Christmas full moon
It is a very nice moon this Christmas.
The Anti-Christ is coming!
Christmas quiz Q1, especially for those whose analytical and critical faculties have been sharpened at the chess board …
What is the probability of a full moon at Christmas?
13/365?
Nice try ‘lunar’ with 13/365 or 0.035615. Your idea is right, and certainly indicates that a full moon is no rarer on 12-25 than any other day.
To be pedantically accurate, since the lunar cycle is 29.53059 days, the probability is 0.033863, a couple of permil points less.
A full moon at Diwali … now that’s what I call rare.
Maybe the original blog-item assumed some lunar contribution to what is purely a solar calendar.