A "Blood Moon" refers to a total lunar eclipse, during which the Earth passes between the Sun and the Moon. This alignment causes the Earth's shadow to cover the Moon, resulting in a reddish hue. The phenomenon occurs because the Earth's atmosphere scatters sunlight, allowing only the longer red wavelengths to reach the Moon. Blood Moons are often associated with various cultural beliefs and myths. They can be observed several times a year, depending on the lunar cycle. The term has gained popularity in recent years, especially in discussions about astronomy and celestial events.