2018 March 31 full moon is the second and final Blue Moon of this year. A Blue Moon is defined as the second of two full moons to occur in one calendar month. January had two full moons, and March does too. It is quite rare to have two Blue Moons in a single calendar year of 2018 (It last happened in 1999) and it won’t happen again until 2037.
2018年3月31日滿月是今年的第二個也是最後一個藍月亮。 藍月亮被定義為在一個日曆月內發生的兩個滿月中的第二個月。 一月有兩個滿月, 而三月也有。 在2018年的一個歷年裡有兩個藍月相當罕見（最後一次發生在1999年）, 直到2037年才會再次發生。
