I saw this article that said, "Blue moon to shine with Mars, Jupiter and Saturn on Halloween." So what's a blue moon?
It's not actually a blue moon. It just means that it's the second blue moon in the same month. It looks like this year's Halloween will have a blue moon. The first full moon in October was on October 1st. That one was a Harvest Moon. A Harvest Moon is the full moon closest to the fall equinox, the day that the sun is directly over the equator.
A NASA articles says, the last time there was a full moon on Halloween was in 2001. It says that on average, there's a full moon on Halloween every 19 years.
Oh well... sad I won't be out trick or treating under the blue moon this year.
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