On Monday, you can watch Mercury sail across the sun.

It’s an astronomical event known as the Mercury transit, and it occurs about a dozen times a century.

During the trip, the planet will appear as a black speck awash in the sun’s light. You can track its celestial silhouette for about seven hours, starting around 7:12 a.m. Eastern and ending around 2:42 p.m.

Depending on the weather, it should be visible from most parts of the world, except for Australia, New Zealand and parts of East Asia.