Relevant math here: http://jxcrystals.com/publications/Mirrors_in_Dawn_Dusk_Orbit_AIAA_Tech_Conf_Final_2013.pdf http://jxcrystals.com/publications/Mirrors_in_D

Relevant math here: http://jxcrystals.com/publications/Mirrors_in_Dawn_Dusk_Orbit_AIAA_Tech_Conf_Final_2013.pdf http://jxcrystals.com/publications/Mirrors_in_Dawn_Dusk_Orbi... Money quote: "Applying this formula for a mirror in orbit at an altitude of 4200 km gives a sun spot diameter on earth of 42 km". The report claims "The satellite would be able to light an area with a diameter of 10 to 80 kilometers, while the precise illumination range can be controlled within a few dozen meters", so either it's in a lower sun-synchronous orbit [1] (and maybe there is more than one) or it's a parabolic reflector [2] with controllable focal length, and there is no cause for concern. [3] [1] https://en.wikipedia.org/wiki/Sun-synchronous_orbit https://en.wikipedia.org/wiki/Sun-synchronous_orbit [2] https://en.wikipedia.org/wiki/Parabolic_reflector https://en.wikipedia.org/wiki/Parabolic_reflector [3] https://en.wikipedia.org/wiki/Sun_gun https://en.wikipedia.org/wiki/Sun_gun