The countdown has begun as the world prepares to see Venus make its transit across the Sun, a rare event and the last of its kind this century. On June 5-6, 2012 we should be able to watch Venus appear as a black spot and glide slowly across the face of the Sun. Some quick facts about the Transits of Venus:
- They occur at gaps of 8,121.5, 8, and 105.5 years (the full pattern repeats every 243 years).
- The last one occurred in 2004. After 2012, the next one is not due until 2117!
- Depending on where you are (see map below), you may be able to watch the full transit, only the entry (before sunset), only the exit (after sunrise), or neither.