Blue Moon

From: Peter Metcalfe <metcalph_at_voyager.co.nz>
Date: Sat, 06 Feb 1999 12:45:16 +1300

Philip Hibbs:

>Apparently, there was a Blue Moon in January, and I missed it! Never mind,
>there's another in March, at 10:49 UTC on the 31st.

>A Blue Moon, for those perplexed, is a second moon in a month.

According to a recent definition spread by Trivial Pursuit. Prior to that, it meant the Moon actually appeared blue (hence the name) and so only was visible when there was some odd stuff in the sky (volcanic ash springs to mind).

• --Peter Metcalfe

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