Watch Mercury travel across the face of the Sun (VIDEO)

© NASA
It only happens a few times a century: the smallest planet in our solar system is passing between the Earth and the Sun, allowing us a rare glimpse of Mercury in motion.

The planet appears as a small black dot against the bright background of the Sun, traveling diagonally in front of the solar sphere over several hours today.

The planet has already come into view and you can follow the transit of Mercury live via Ruptly's feed:

READ MORE: Monday’s rare Mercury transit across the Sun: What you need to know (VIDEO)