The ‘Mercury Transit’ will occur starting 7:12 AM Eastern Time (or 4:42 PM Indian Standard Time) and will be completely visible in eastern America and partially visible in Europe, Asia (including India) and western America. The event may be visible for as much as 7.5 hours but in most regions it will be seen only for a short period of time. Of course, NASA will live stream the transit on their Facebook page and NASA TV, which you can watch here.
This rare phenomenon will uncover previously unknown facts about Mercury as well as the Sun. If you are interested in the science behind it, you can visit NASA’s website about the transit.
Here is a NASA feature about this historic event: