Watch the Shadow of Mercury Cross the Sun in Real Time

The Transit of Mercury—an astrological event that takes place just 13 times per century—is currently underway. The event occurs when our solar system’s smallest planet, Mercury, appears to cross the sun from Earth; producing a tiny, dot-sized shadow moving across the massive face of the glowing sun. The phenomenon is only viewable by telescope and other special equipment, but if you’d like to catch the event in real time, you can head to Slooh where they’re live streaming it.