User request: rotation speed, zoom, satellite line of sight

[oliver-phet]

I would love to see the following features implemented in the to-scale simulation:
a) rotation of earth (speed matching the "earth minutes" clock)
b) the possibility to zoom out a little further in the earth/satellite type of sim. (at least to a radius of 42200 km)
-> The purpose is to simulate/explain/discuss geostationary satellites.

c) An optional line of sight between the surface of earth and the satellite would be of great value, but is not strictly necessary.

In addition, I think that there should be an option to switch to "natural lighting" each object should have a bright side (facing the sun) and a dark side (facing away from the sun). I am aware that this is not an optics simulation and some people may prefer not to have this, but in my opinion this small change would make the simulation look much more realistic.

[samreid]

This has not been requested for the upcoming release, so I'll mark as deferred for now.

[samreid]

@arouinfar should we leave this open as a potential future improvement, or close as likely outside the scope of this sim?

UPDATE: I saw other issues that make sense to be deferred, so I'll re-mark this as deferred for now.