Blood moons, or total lunar eclipses where the Moon appears reddish, occur a few times a year on average, though visibility varies by location.

What Is a Blood Moon?

A blood moon happens during a total lunar eclipse, when Earth passes between the Sun and Moon, casting a shadow that scatters sunlight to tint the Moon red.

This reddish hue comes from atmospheric filtering of longer red wavelengths, much like a sunset.

Not every full moon triggers one, due to the Moon's tilted orbit—only alignments work.

How Often Do They Happen?

Total lunar eclipses average 2-3 per year globally, viewable from half the planet each time.

From one spot on Earth, expect 4-5 per decade, but patterns shift by century.

A rarer "tetrad" (four in two years) happens variably—none from 1582-1908, but 17 expected from 1909-2156.

Recent and Upcoming Events

The September 7-8, 2025, blood moon lasted 82 minutes, visible in the Eastern Hemisphere.

North America's next is March 2-3, 2026, with 58 minutes of totality over the Pacific, Americas, Australia, and East Asia.

Tetrads cycle every few centuries, with frequent periods like now (7 this century).

Myths vs. Science

Ancient cultures saw blood moons as omens, but science predicts them precisely via orbital math.

Tetrads follow 600-year patterns, not prophecies—38 since 500 AD.

No doomsday link; they're stunning natural shows.

Aspect| Frequency| Notes 38
---|---|---
Total Lunar Eclipses| Every 18 months avg.| 2-3/year worldwide
From One Location| 4-5/decade| Varies by century
Tetrads| Varies (e.g., 17 next 250 yrs)| 6 months apart

TL;DR: Blood moons happen 2-3 times yearly, with the next big one March 2026—mark your calendar for a cosmic red glow.

Information gathered from public forums or data available on the internet and portrayed here.