Mercury makes rare move across the sun

Visual from Kolkata: Transit of planet Mercury across the Sun, happens only 13-14 times in a century (ANI photo)
Mercury has begun a relatively rare move across the sun.
The solar-planetary ballet got underway just after 7 am on the east coast with the smallest planet appearing as a tiny black dot on the face of the sun. The transit will last for a total of about 7 ½ hours. The last time it happened was 2006. It will happen again three years from now, but then not until 2032. NASA says t