(Long Night of the Sciences) at the Berlin Archenhold Observatory. Things to do/see there:
* If the weather is nice, we will be able to observe with the public: the Sun, Saturn, Mars, Jupiter (in close conjuction with Luna), some bright Deep Sky objects such as Epsilon Lyrae, Alcor&Mizar, ....
and exhibits in the main building
* Visit the telescopes, including the world's largest refractor
* Attend a line-up of presentations (to be announced)