Skywatchers tonight (March 31) will be treated to the second and final Blue Moon of 2018, just
on the eve of Easter. What is this type of moon, and is it actually blue?
For those who wanted to see an aqua-hued orb, sorry but the term "Blue Moon" has nothing to do with the color. Instead, it refers to the appearance of an additional full moon in a given time period. Under the most popular definition today, a Blue Moon is the second full moon in a calendar month.
