On the calendar

Eclipses

When the sun, Earth and moon line up exactly.

When and where to look

A few times a year somewhere on Earth. Lunar eclipses are visible from half the planet at once; a total solar eclipse may not cross the same place for centuries.

Why it happens

A lunar eclipse is Earth’s shadow crossing the full moon, often turning it a deep red; anyone who can see the moon can watch it. A solar eclipse is the moon passing in front of the sun, and it is only seen along a narrow path.

Find a walk · Explore Places

The next dates

All of this year’s sky dates

How to catch one

  • Lunar eclipses are safe to watch with your eyes; binoculars show the colour.
  • Never look at the sun directly, even when it is partly covered. Use eclipse glasses or a pinhole.
  • Check whether an eclipse is visible from where you are before you plan around it.

More to step out for