This is an astronomy story that comes up only once in a blue moon, like on Friday. Maybe.
There is a full moon tonight, the second this month. About every 18 months you get two full moons inside the same calendar month. That’s called a “Blue Moon” even though the moon isn’t actually blue.
There’s a rare ‘blue moon’ on Friday, a fitting wink to Neil Armstrong by the cosmic calendar. That’s the day of a private service for Armstrong, who died last Saturday in Ohio at age 82.