We'll soon be getting views of Ceres from the
Dawn spacecraft, but here David Dickinson tells us that the
views from Ceres would be very interesting.
The most frequent transits we see are Mercury passing in front of the Sun. There were fourteen of these in the twentieth century. Transits of Venus are rare. There were none in the twentieth century and two in this century – in 2004 and 2012. It will be over a hundred years from now when Venus passes between us and the Sun.
However there will be three transits of Venus visible from Ceres this century and hundreds of transits of Mercury over several centuries. And since Ceres is farther away from the Sun than both Earth and Mars, we might expect to see transits of both of those planets. And yes, if anyone is hanging out on Ceres in June 2033, they could see a transit of Mars. But transits of Earth seem to be rare – there doesn't seem to be a single one expected during the current millennium.