A full moon on Halloween only happens every 18 to 19 years; but this year is rarer than most, because it'll be visible in every time zone on Saturday, something that hasn't happened since 1944. And the next one won't happen until 2039.
It's also known as a "blue" moon, even though the color won't change. Scientists use the term to describe the second full moon of the month.
And we get an extra hour to enjoy it... Daylight Saving Time ends at 2am Sunday, so set your clocks back one hour before going to bed Saturday night.
(Photo: Getty Images)