Direct comparison
Lunar vs solar eclipse
A solar eclipse happens when the Moon passes between the Sun and Earth; a lunar eclipse happens when Earth passes between the Sun and the Moon.
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Side-by-side comparison
| Dimension | Solar eclipse | Lunar eclipse |
|---|---|---|
| What is in shadow | Part of Earth, shaded by the Moon. | The Moon, shaded by Earth. |
| Line-up | Sun — Moon — Earth (Moon in the middle). | Sun — Earth — Moon (Earth in the middle). |
| Moon phase needed | New Moon. | Full Moon. |
| When you see it | During the day. | During the night. |
| Where it is visible | A narrow track across part of Earth. | Anywhere the Moon is above the horizon — half the planet. |
| How long it lasts | Totality lasts only a few minutes at any spot. | Totality can last over an hour. |
| Safe to view | No — never look directly without proper solar filters. | Yes — safe to watch with the naked eye. |
| Appearance | The Sun is hidden; the corona may appear at totality. | The Moon dims and often turns coppery red. |
| How often | Total solar eclipses are rare at any one place. | Lunar eclipses are seen more often from a given place. |
Why eclipses do not happen every month
You might expect an eclipse at every new and full Moon, but the Moon’s orbit is tilted by about five degrees relative to Earth’s path around the Sun. Most months the Moon passes a little above or below the exact line, so its shadow misses Earth and Earth’s shadow misses the Moon. Eclipses occur only during the periods when the Moon crosses that line at the right phase. This is also why a solar eclipse is always followed or preceded by a lunar eclipse around the same fortnight.
Common questions
FAQ
Why is a lunar eclipse safe to watch but a solar eclipse is not?+
During a lunar eclipse you are looking at the Moon, which only reflects sunlight, so it is perfectly safe with the naked eye. A solar eclipse means looking toward the Sun itself; even a thin sliver of the uncovered Sun can permanently damage your eyes. Solar eclipses must only be viewed through certified solar filters or by projection.
Why does the Moon turn red during a total lunar eclipse?+
Even when Earth blocks direct sunlight, some light bends through Earth’s atmosphere and falls on the Moon. The atmosphere scatters away blue light and lets red light through — the same effect that reddens sunsets — so the shaded Moon glows a coppery red. This is why a totally eclipsed Moon is often called a “blood Moon”.
Why is a total solar eclipse visible from only a small area?+
The Moon is much smaller than Earth, so the dark core of its shadow is a narrow spot — at most a couple of hundred kilometres across — that sweeps a thin path over the surface. Only people inside that track see totality. A lunar eclipse, by contrast, darkens the whole Moon at once, so everyone on the night side of Earth can watch it.
