Where to be? – Transit of venus.
Whether and when you can see the 2012 transit of Venus depends on your location. Most of North America can see the transit of Venus during afternoon and evening (find a clear western horizon!) on June 5, whereas much of Russia , Asia (Europe,India, China, etc)sees the end of the transit in the morning (find a clear eastern horizon!) on June 6.
To see an animation of how the sun appears at Region X, near Iceland, see http://youtu.be/3b7a_zXMnnU.
The diagram (click for enlarged PDF version) shows the path of Venus across the sun and the contact times from an earth-centered perspective. However, from different locations on earth, the exact contact times vary by minutes or seconds. That slight difference in times is the essence of a transit’s value, for it allowed astronomers to calculate the size of the solar system. The entire event takes about 6 hours 40 minutes. The times in the diagram are in Universal Time, or essentially Greenwich Time.
So, is the transit of Venus visible June 5 or June 6?
your time zone answers this question. Generally, for the Americas where it is visible (blue colors on map below) the 2012 transit occurs the evening of Tuesday, June 5, 2012. For Eurasia and Africa where it is visible (sage colors on map), the latter part of the transit is seen the morning of June 6, 2012. Map courtesy of Steven van Roode.
[Note: Some confusion may arise from published tables with a title stating the 2012 transit of Venus is on June 6. By default, these tables are titled by the mid-transit point in Universal Time. Because the middle of the transit occurs just after midnight on June 6 in Greenwich Time (even though it’s not visible then in Greenwich), the title nonetheless affirms June 6. ]
Image Courtesy – http://transitofvenus.org/june2012/where-to-be
Data Courtesy – http://transitofvenus.org/june2012/where-to-be