The Sky at Night celebrates 55 years with the second of its special programmes. Sir Patrick picked out 55 objects in the April sky and asked viewers to take part in his Moore Marathon. He finds out how everyone got on, with help from the team.

The Sky at Night travels to the Arctic Circle and the archipelago of Svalbard to see the Transit of Venus. This astronomical wonder, where the planet Venus passes in front of the Sun, is the last one in our lifetime; but as ever, the clouds test the team's nerves.