Bloch's grandfather decided to move to Lyon when Alsace was occupied by the Germans after the French defeat during the Franco-Prussian War in 1871.

[3] In 1918, Bloch obtained a scholarship to study at the Ecole Technique Municipale (the City Technical School), which was established by the then mayor of Lyon, E.

She also completed Differential and Integral Calculus, Rational Mechanics, General Physics and Advanced Astronomy.

[4] During this collaboration on spectrophotometry of stars and the light of the sky at night, Bloch was described as one of the two young astronomers – the other was Charles Fehrenbach – who was observing at the Haute-Provence Observatory.

[6] Their works were able to determine the color temperature of the cool component of Z Andromedae in their spectroscopy of the variable star.