On Saturday, October 31, 2020—aka Halloween—the sun will set at 5:38pm, and 20 minutes later, at 5:58pm, a full “blue moon” will rise over Boston. The astronomical event will mark the first time since 1944 that all US time zones are treated to a full moon on Halloween.
Depending on your definition of a “blue moon,” Halloween 2020’s full moon (i.e. “Hunter's Moon”) doubles as a blue moon. In recent years, people have been using the term “blue moon” for the second of two full moons in a single calendar month
. 10/1/20's full “Harvest” moon + 10/31/20's full “Hunter’s” moon = Halloween 2020’s Blue Moon
In other words, October 2020 is considered a “blue moon month” because two full moons occur in one month, i.e. 10/1 & 10/31.
An older definition of blue moon is that it’s the third of four full moons in a single season.
In that case, the next true blue moon will occur on August 22, 2021.
HOW TO SEE THE MOON:
✔️ Blue moon
The moon rises in the east, so you're going to want to look that way. If you're trying to grab photos, go somewhere facing east with a picturesque foreground. Two well-known spots to watch a Boston moonrise are North Point Park
in Cambridge and the BU Bridge
on the Boston/Cambridge line.
See the below picture for reference.