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Types of Solar and Lunar Eclipses, Explained

Not every eclipse looks the same. Here are the distinct types of solar and lunar eclipses and what causes each one.

Total solar eclipse

Occurs when the Moon completely covers the Sun’s visible disk, as seen from a narrow path on Earth, briefly revealing the Sun’s outer atmosphere (the corona) and turning day briefly into near-darkness along that path.

Partial solar eclipse

Occurs when the Moon covers only part of the Sun’s disk, as seen from outside the path of totality. Most people who witness a solar eclipse actually see a partial eclipse, since the path where a total eclipse is visible is very narrow.

Annular solar eclipse

Occurs when the Moon is near the farthest point in its orbit from Earth and appears slightly too small to fully cover the Sun, leaving a bright ring (annulus) of sunlight visible around the Moon’s silhouette at the eclipse’s peak — this is why it is sometimes called a “ring of fire” eclipse.

Total lunar eclipse

Occurs when the Moon passes completely into Earth’s darkest shadow (the umbra). Sunlight refracted through Earth’s atmosphere still reaches the Moon, scattering blue light and letting red light through, which typically gives the Moon a reddish tint during totality, sometimes called a “blood moon.”

Partial lunar eclipse

Occurs when only part of the Moon passes into Earth’s umbra, leaving the rest of the Moon’s disk still lit, so only a portion of the Moon visibly darkens.

Penumbral lunar eclipse

Occurs when the Moon passes only through Earth’s outer, lighter shadow (the penumbra) without entering the darker umbra at all, producing a subtle dimming that is often difficult to notice with the naked eye compared to other eclipse types.

Why eclipses do not happen every single month

The Moon’s orbit around Earth is tilted about 5 degrees relative to Earth’s orbit around the Sun, so most months the Moon passes slightly above or below the Sun-Earth line rather than directly in front of or behind it. Eclipses can only occur near the two points in the Moon’s orbit, called nodes, where its tilted path crosses Earth’s orbital plane, which is why they happen only a handful of times a year rather than at every full or new moon.

Solar and lunar eclipse safety are very different

A solar eclipse requires proper eye protection (certified eclipse glasses, not sunglasses) at every moment except the brief period of full totality during a total solar eclipse, since looking directly at even a sliver of the Sun can cause serious eye damage. A lunar eclipse, by contrast, is entirely safe to view directly with the naked eye at any point, since you are simply looking at the Moon’s reflected light, not the Sun.

Frequently Asked Questions

Why is a total solar eclipse visible only from a narrow path on Earth?

The Moon’s shadow that produces total darkness (the umbra) is relatively small compared to Earth’s surface, and it sweeps across the globe in a narrow band as the Moon and Earth move, which is why totality is only visible along that specific path, while a much wider surrounding area sees a partial eclipse instead.

Is it safe to look at a lunar eclipse directly with your eyes?

Yes, completely safe. Unlike a solar eclipse, a lunar eclipse involves the Moon passing through Earth’s shadow and does not involve looking directly at the Sun, so no special eye protection is needed to view it.