While a blue moon seems rare, a full moon on Halloween across time zones is even more rare -- an event that hasn't occurred since 1944: 76 years ago & long before most of us were born. So this truly a once-in-a-lifetime event.

"The origin of Halloween itself can be traced back to Samhain (pronounced SOW-in, which rhymes with COW-in), which was an ancient Celtic festival that was celebrated to mark the end of harvesttime. It was also the end of their year and the beginning of the new year, so it was “in between” the two years. It’s said that the spirits of the dead wander around during this time in the moonlight."

This full Moon is also known as the "Hunter’s Moon", as this is the time of year when humans and animals alike are stocking up on food in preparation for the long winter ahead." Old Farmers Alamanac