Science
How do solar eclipses happen?
A solar eclipse happens when the Moon passes directly between the Sun and Earth, casting its shadow on us. For a few minutes, the Moon blocks the Sun's light, turning day briefly to twilight along a narrow path.
See it in motion.
Watch a 2-minute animated lesson that shows exactly how solar eclipses works.
Step by step
- 1The Moon moves between the Sun and Earth.
- 2Its shadow falls on part of Earth's surface.
- 3People in the shadow's path see the Sun partly or fully blocked.
- 4It only happens at a new moon, when alignment is just right.
Frequently asked questions
- What causes a solar eclipse?
- The Moon passing directly between the Sun and Earth, blocking the Sun's light and casting a shadow on Earth.
- Why don't eclipses happen every month?
- The Moon's orbit is tilted, so it usually passes above or below the Sun rather than directly in front.
- Is it safe to look at a solar eclipse?
- No — looking directly at the Sun can damage your eyes; use certified eclipse glasses.