Question: Who was born later, Luboš Zákostelský or Félix Savary?
Sentence (from "Félix Savary"): In his works" Mémoire sur les orbites des étoiles doubles" and" Sur la détermination des orbites que décrivent autour de leur centre de gravité deux étoiles très rapprochées l'une de l'autre", published in 1827, he was the first to use observations of a visual binary star to calculate the orbit of one star about the other.
Relevant evidence: No