Please check out this nice film from the California Academy of Sciences on tomorrow’s once in a lifetime event:
Venus transits have been used throughout history to help measure the distance between the Earth and the Sun, an “astronomical unit” or AU, in particular, the transit pairs in 1761, 1769, 1874 and 1882. Here is a great newspaper account from our fair city at the 1882 transit:
“Many of the residents of San Francisco were noticed yesterday with a piece of smoked glass to their eye, looking curiously at the sun, between the hours of about sunrise and noon, during which time Venus was visible; and even under these disadvantages without the aid of a suitable telescope, it was still a grand and beautiful spectacle. All who missed a view of the transit of Venus are to be commiserated, for should they live to be 100 years old the chance will not come again occur.” (San Francisco Chronicle)
The transit tomorrow was paired with the one in 2004. The next one will not occur until 2117. DON”T MISS IT!!!!