Where is the window Shepard is looking out in the opening scene

@Dragoness31 

Well, there is no planet in the Arcturus system that could have such an atmosphere. (with a cloud cover)

I think in the timeline it must have bean way before the jump through the Arcturus Prime Relay .

It's the moment they decide to use Shepard as their candidate for the Spectres. So it would have taken time to confirm that and get Nihlus into Normandy to evaluate Shepard.

For me it always was Earth, but I did not specifically analysed the view.