The natural phenomenon when the moon passes through the Earth's shadow is known as a "lunar eclipse." This event occurs when the Earth is positioned directly between the sun and the moon, causing the Earth's shadow to obscure the moon's light. There are three types of lunar eclipses: total, partial, and penumbral. During a total lunar eclipse, the moon may take on a reddish hue, often referred to as a "blood moon," due to sunlight filtering through the Earth's atmosphere. Lunar eclipses can be observed from anywhere on the nighttime side of the Earth, making them accessible celestial events for many people.