Just hover a drone right over it at significant height with a disco ball underneath. Or tether some kind of balloon with reflectors on it above the beam?
Just hover a drone right over it at significant height with a disco ball underneath. Or tether some kind of balloon with reflectors on it above the beam?
I was thinking of something more exotic like a space elevator, but Captain Degrasse would probably point out that those need to be near the equator, too, and I didn't want to give him the chance to correct someone else on that.