The conversation between human and AI assistant.
Why is the number 13 considered both lucky and unlucky?
Do you know why there are specifically 13 full moons in a year?
Yes, there are 13 full moons in a year because the lunar cycle is approximately 29.5 days. Since most months have 30 or 31 days, there are usually 12 full moons in a year, with one month having two full moons. However, every few years there is an extra full moon, which is known as a "blue moon." This means that there can be 13 full moons in a year.