Sic Transit Gloria Mercury

On Monday, Mercury passed directly between the Earth and the Sun, the last transit it will make until November 2019. Judging from my Twitter and Facebook feeds, it was watched by approximately eleventy bazillion people. I got to watch it through my own small solar 'scope, which was lovely (sorry, no pix; I still haven't figured out how to get good shots with my phone or my DSLR). Seeing it with your own eyes through a properly protected telescope is amazing, but not possible for everyone. Happil...