What is a Total Lunar Eclipse?

A total lunar eclipse occurs when the Earth’s shadow completely covers the moon, turning it a deep red color. This happens when the sun, Earth, and moon are perfectly aligned, with the Earth in the middle.

Tonight’s Total Lunar Eclipse

Tonight, skywatchers in the Western Hemisphere will have the opportunity to witness a total lunar eclipse. This is the first of a rare series of five total lunar eclipses that will occur over the next two years.

The eclipse will begin around 2 a.m. Eastern time, on Tuesday morning, when the moon will start to move into the Earth’s shadow. From 3:06 to 4:24 am, the moon will be fully immersed in the Earth’s shadow, blocking all sunlight from reaching it.

Why Are Lunar Eclipses More Common Than Solar Eclipses?

Lunar eclipses are more common than solar eclipses because they are less dependent on the precise alignment of the sun, Earth, and moon. For a solar eclipse to occur, the moon must pass directly between the sun and Earth. This only happens about once every 300 years at any given location on Earth.

In contrast, lunar eclipses can be viewed almost anywhere on the night side of the Earth, provided it is clear. This is because the Earth’s shadow is much larger than the moon, so it is more likely to cover the moon completely.

How to Watch Tonight’s Eclipse

If you want to watch tonight’s eclipse, find a spot with a clear view of the eastern horizon. The eclipse will be visible from anywhere in the Western Hemisphere, weather permitting.

If you are unable to see the eclipse in person, you can watch it live online through NASA or the SLOOH observatory.

Other Upcoming Total Lunar Eclipses

According to an online eclipse calculator, the nation’s capital should be in for another total lunar eclipse in October, and another next fall. Such a high frequency of recurring eclipses is a rare occurrence.

Additional Resources

• NASA | Understanding Lunar Eclipses
• Watch the eclipse live on YouTube
• SLOOH observatory live stream