Near-Total Lunar Eclipse Will Turn Moon Blood Red – The New York Times

The moon takes on a reddish hue during a lunar eclipse because sunlight is filtered through Earth's atmosphere. As sunlight passes through our atmosphere, blue light is scattered away, leaving red and orange light to bend around the Earth and illuminate the moon. This phenomenon is similar to how sunsets appear red, giving the eclipsed moon its distinctive 'blood red' color.

A near-total lunar eclipse occurs when almost the entire moon passes through the darkest part of Earth's shadow, known as the umbra, but a very small sliver remains outside. In contrast, a total lunar eclipse sees the entire lunar disk immersed within the umbra. While both events cause the moon to dim and often turn reddish, a near-total eclipse means a tiny portion of the moon may still receive direct sunlight, making it slightly less dramatic than a full totality.

To best witness the near-total lunar eclipse, find a location with a clear, unobstructed view of the moon, away from city lights if possible. No special equipment is needed, as the eclipse is visible with the naked eye. Binoculars or a small telescope can enhance the view, revealing more detail and the subtle color changes. Dress warmly and allow your eyes to adjust to the darkness for the best experience.