Mercury will transit the disk of the Sun on May 9 from 11:20 to 18:45 UTC. This is a rare event, and it will be observed by the Solar Dynamics Observatory.  The last transit observable from the Earth was on November 8, 2006 and the next one won’t be visible until November 11 2019. Remember:

The row of black dots indicate where Mercury will pass.  SDO will be making special observations of the transit, and will be providing near-real time updates of images as they come.  These observations allow SDO scientists to better understand how the Sun is oriented on SDO’s cameras.

Helioviewer will also be providing the images SDO.  Check back on May 9 2016 to watch Mercury transit the Sun!