I will try it, even if no one else from Germany will be found. ;-)
Just hope to get a clear sky and to be allowed to go to the roof at work.

Just also want to say that Nikon has a crop factor of 1.5 because the DX-sensors are slightly bigger than Canon APS-C. Focal length for Nikon DX (APS-C) would be around 133 mm. Not that this cause some problems with the calculation. ;-)
Here are the crop factors for some Nikon cameras: https://de.wikipedia.org/wiki/DX-Format
Unfortunately, just in German.