Two examples of calendars showing the visibility of an object from an observatory. Top: galactic Centre from the VLT. Bottom: large Magellanic Cloud from VRO. The fraction of observing time lost due to satellites is indicated by the colour scale (1 indicating that all exposures are damaged), for 300 s exposures with FORS2 and 15 s on the LSST camera, respectively. The satellites are the 60+ thousand from Table 1. The blue shading marks daytime and the blue contours indicate the twilights. The elevation of the object is indicated by the greenish contour lines and the grey shading indicates the times when the object is below 20° elevation.