原來今年有blue moon仲要係Halloween
勁邪
Normally, there are 12 full moons in a year because one occurs each month. But in 2020, October will have two full moons, once on October 1 and then again on October 31.
Two full moons in the same month is known as a "blue moon." And the fact that the second one falls on Halloween truly makes this event "once in a blue moon."