Why not, at least for head tracking users, just build in the option to change FOV on the fly to the realistic level (39?) so that we can at least conduct more or less realistic "scans" by zooming in the view and carefully scanning a section of the sky at realistic size? Sure, its not as quick or wide as 70 fov or our eyes in reality, and its not all that elegant, but it'd do the job better than most any other solution I'd think. Even if it would feel like using binoculars at times.
As many have pointed out anyway, it takes time to scan the sky.
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