Question

the second full moon in the month​

Answer 1

Answer:

Blue Moons as the second full moon of a calendar month.

Explanation:

By this definition, there was a Blue Moon on July 31, 2015; January 31, 2018; and March 31, 2018. The next one will be October 31, 2020. The time between one full moon and the next is close to the length of a calendar month.

Answer 2

Blue Moon" month with two full Moons. The first full Moon is on October 1st. The second, a so-called "Blue Moon," occurs on October 31st. In recent years, people have been using the name Blue Moon for the second of two full moons in a single calendar month.