So I was playing around with Celestia and watching last year's transit of Mercury and this year's transit of Venus. They seemed pretty accurate to diagrams I've seen for ingress/egress locations. Then I got an idea. I flew to Mars and went looking for a transit of Earth, and to my surprise I found one, on the November 7th 2005 opposition of Mars (conjuction of Earth? ) Does anyone know if this is accurate, or how often an occurence this is? It's a shame we won't be able to see it!