Artificial Eclipse 4-8-24? How They Made 2 Suns?!

This invention: large artificial illumination system intended to be used as an artificial sun in testing of space vehicles & similar equipment. More specifically, the invention comprises a more or less planar array of a large number of modular units, each unit having a light source & a collimating system and being of such luminous power & quantity that the total array of these modular unit-s has the approximate intensity of the sun.

US Patent US3247367A Artificial Illumination System Artificial Sun

ESA Satellites to Test Razor-Sharp Formation Flying > Proba-3 will make its own solar eclipses 2 spacecraft align to create eclipses for around 6 hrs per orbit, starting on approach to its farthest point from Earth (apogee).

The 2 spacecraft use radio inter-satellite links to communicate, star trackers will be used by both craft for determining their attitude.

Satellite Constellation Formation-
Flying h/t Shell, Sam Brown