Total lunar eclipse or blood Moon: What Is It and When to See the Phenomenon?

All About the Blood Moon: Origin, Meaning, and Dates

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Published in 03-06-2025 Update 05-03-2025

Photo by Zoltan Tasi
The red moon is a natural phenomenon that has been observed by mankind since time immemorial. Total lunar eclipses, which produce this effect, have been recorded and documented throughout history.

The "blood moon" is a term that evokes mystery and wonder. But what exactly is this phenomenon? It is a total lunar eclipse, where the Earth comes between the Sun and the Moon, casting its shadow on our natural satellite. Sunlight, when filtered through the Earth's atmosphere, disperses, letting through mainly red light, which dyes the Moon a characteristic reddish color.

How does it happen?

A total lunar eclipse occurs when the Earth, the Sun and the Moon align perfectly. The Earth's shadow, called the umbra, blocks the direct sunlight that normally illuminates the Moon. The Earth's atmosphere acts as a prism, deflecting sunlight and filtering colors, letting through mostly red. This phenomenon, known as Rayleigh scattering, is similar to that which produces reddish sunsets.

When and how to observe it?

To observe a blood moon, you need to be on the night side of the Earth during a total lunar eclipse. No special equipment is required, although binoculars or a small telescope can enhance the experience.

Blood Moon: Why It Happens and How to Observe It

Photo by Nick Owuor (astro.nic.portraits)
General Frequency of Lunar Eclipses: On average, two lunar eclipses occur each year somewhere on Earth. However, the annual number can vary from zero to three. It is important to remember that for a lunar eclipse to occur, the Moon must be in its full moon phase and must cross the Earth's shadow.

Frequency of "Blood Moons" (Total Lunar Eclipses): Total lunar eclipses are not as frequent as partial or penumbral lunar eclipses. On average, a total lunar eclipse occurs approximately every two and a half years in a specific location on Earth. However, globally, several total lunar eclipses typically occur per decade. For example, the most recent "blood moon" was on March 14, 2025, and the next one visible in various parts of the world will be on September 7-8, 2025.

Tips for observing:

* Find a dark spot: Get away from city lights for better visibility.
* Check the weather forecast: Make sure the sky is clear.
* Enjoy the show: The blood moon is a unique and beautiful natural phenomenon.

The blood moon has captivated humanity for centuries, inspiring myths and legends. Today, thanks to science, we can better understand this fascinating astronomical event.