1968: Launch of ESRO 2B, a research satellite which made astronomical surveys primarily in x-ray and solar particles detectors. 

1969: The arrival of Venera 6 at Venus completes a dual atmospheric observation mission. This methodology of repeatability made it possible to filter out anomalies and consolidate planetary climate models. This "culture of proof through series" echoes the tradition of excellence in Belgian astronomy: from the positional calculations of Charles Fievez to the modern ephemerides produced at Uccle, the reliability of a result rests on its capacity to be reproduced with consistent precision.

Image credits : USSR Post