Get a filter and look up in the sky -- you see that dot? That is Venus.
A rare opportunity to see Venus move across the face of the Sun will happen tonight, starting at 6:09 PM. This once in a lifetime occurrence will not happen again until 2117.
The planetary transit will allow people to observe the planet as a small dot crossing the Sun.
The Arboretum is hosting a viewing event open to the public this evening. They will have telescopes with special filters for looking at the Sun. Venus will make its transit across the sun for about seven hours. Organizers say they'll be there till sunset.
The same thing occurred in 2004, however, you couldn't see it in North America. This is the last transit for more than 100 years.